Can you believe it has been 10 years since "Keeping Up With the Kardashians" first aired? It seems like the Kardashians have been a part of the American lexicon for most of our lives, and after 13 seasons and 10 spin-off series later, it seems like long ago when Kim was only known for her sex tape. The Kardashians aren't just a reality television sensation — they are business moguls, fashionistas, mothers, models and a representation of all that is good and bad in millennial culture.

When we think about the Kardashians, we think of Kourtney, Kim, and Khloe, and even Kendall, Kylie and Kris, even though they actually have the last name, Jenner. But the Kardashians wouldn't be so famous without the men who have been in their lives. All of them have been pretty infamous — from Ray-J to Kanye — and they weren't just part of the show; they helped shape the stories of the most famous women of our generation. Some are long gone, but others are still part of the crazy life of the Kardashians. Of course, they have their own secrets too, so we have uncovered them.

Here are 15 things you didn't know about the men behind the Kardashians.

15 Daddy Dearest

Let's start with the patriarch of the Kardashian Klan. Robert Kardashian Sr. was a successful business, who founded the family's Hollywood lifestyle. He was married to Kris for 13 years before they divorced and she married Bruce Jenner. But the two stayed close while they were raising their girls, and Kris was best friends with Nicole Brown Simpson while Robert was best friends with O.J. Simpson. Of course, we all know that things didn't end well for the Simpsons.

Robert Sr. became famous for working on his friend O.J.'s defense, but he wasn't a practicing attorney before or after the trial. He was just trying to help a friend. The curse, though, was the way that he died. He was diagnosed with esophageal cancer in 2003, and he died just eight weeks later at the age of 59. His children still pay homage to their father, who by all accounts was a wonderful man and a great dad.

14 Lord Disick

The Kardashian women stick together, but they don't tend to stick with their men that long. The one who has been around the longest — other than Rob, who we'll get to shortly — is Scott Disick, or Lord Disick, as he likes to call himself. Scott is usually the life of the party, but the problem has been how much he parties.

Scott's life hasn't been very easy, and his relationship with Kourtney has always been a rocky. The couple has three children together, but they've broken up between each of them, and they have been on the outs for more than two years now. Scott has been in and out of rehab, and he has claimed to also have a sex addiction. We're not sure if the rumors are true, but there are purported secrets that Disick has had affairs with Kourt's sisters Khloe and Kendall. One of the worst tragedies is that the Kardashians are all that he has. In 2013, his mom Bonnie died after suffering an illness, and just three months later, his dad Jeffrey died. Scott could use family members to help him battle his demons, but unfortunately, he doesn't have them here anymore.

13 Kris's Boy Toy

Kris's first husband was much older than her, and her second was a few years younger than her. But her latest squeeze shows that age is just a number to her. She began dating Corey Gamble in 2014, when she was 59 and he was just 33 — that was younger than Kourtney and Kim at the time. We all thought it was a fling, but Corey has stuck around for years now, and he even takes on a father-figure role for some of the kids.

We've heard a lot about Corey on Keeping Up, especially (cringe) how he keeps Kris busy in the bedroom. But he still has some secrets.You would think that Corey would play the role of boy toy and let Kris take care of him, but one secret that stays under the radar is that he is a very successful manager, something he and the momager have in common. Corey is part of the management team for Justin Beiber. He may have been the person who introduced Biebs to Kourtney before they had a thing.

12 Call Me Caitlyn

It's difficult to think about the Kardashian men without mentioning Caitlyn Jenner, who was considered the man of the house for two decades when she was known as Bruce and married to Kris. For all of those years, this family member definitely had the biggest secret, but she may not have anything else left that she hasn't revealed to the world.

There are two different sides to this tale, so we expect the actual truth is somewhere in the middle. But with that in mind, Caitlyn has said that she first began to transition before she met Kris, and she could not hide the breasts she had developed at the time. Yet the two fell in love and the process was halted, while they had and raised their two daughters along with Kris's four kids and Jenner's four kids from two previous marriages. After the pair divorced, Caitlyn came out as transgender, and her family seemed supportive, although Kris struggled with accusations that she wasn't the best wife along the way. Caitlyn had another few secrets, though, that she revealed in her book "I Am Cait." Kim and family were given copies of the book prior to the release, but Caitlyn left out the part about going through gender confirmation surgery. She admits that she didn't "trust" the Kardashians, and the book and admission really her step-children. At this point, Caitlyn pretty much only has a relationship with her daughters Kendall and Kylie, and we all have been left to wonder what other secrets she is keeping.

11 Kanye's Breakdown

Many of the men behind the Kardashians have been very successful apart from their relationships with the reality queens, and Kanye West may be at the top of the list. Kanye is one of the top rap artists of the past decade, and he has also brought his talents to fashion and other ventures. But all has not been well for the music mogul, and he goes back and forth between telling everyone his business and keeping secrets.

We all know that Kanye had a breakdown on stage during one of his concerts in 2016, and he was hospitalized and canceled the rest of his tour. He went off about Beyonce and said Jay-Z was a bad friend. He even talked about Mark Zuckerberg lying to the public to make them assume Clinton would win the presidential race (he may have known more than all of his on this one). While that breakdown was public, there is apparently a secret tape that was recorded in the days before the breakdown that really shows his deterioration. According to rumors, Kanye was worried it would come out and ruin his marriage to Kim. Kanye is known for his Twitter rants, claiming at one point that he is $53 million in debt for his work when he really meant that he had personally invested that much in his projects. We're not sure what other secrets that Kanye is holding on to, but we know that the truth could be another rant away.

10 Lamar's Lonely Life

The Kardashians aren't actresses, but we wonder sometimes if they should add that skill to their resumes. That's especially true after the secrets of Khloe Kardashian's marriage to Lamar Odom came out. Khloe seemed so head over heels in love with her man when she married him just a few weeks after the meeting. She talked about wanting to start a family and seemed so very happy, but we learned later that she was keeping Lamar's secrets the entire time.

In 2015, while Khloe and Lamar's divorce was still pending, Lamar nearly died when he was found unconscious in a brothel. He was in a coma for days and had lots of drugs in his system, although he denied drug use in interviews after the event. At that point, it became all too clear that Khloe had been painting a pretty picture of her marriage when things were actually pretty terrible. She later admitted that she wasn't really trying to have a baby; she was just pretending to. Last year, Lamar signed a book deal, where he promised to out some secrets of his famous former in-laws. It looks like he is still healing, and possibly still struggling with addiction. It's not a secret anymore.

9 Kylie's Baby Daddy

The rumors have been swirling for months that Kylie is having a baby — in fact, she may have already gone into labor by the time you read this. The timing is dramatic, in true KarJenner style. She apparently got pregnant as fast as Khloe got married to Lamar — within just a few weeks of starting to date Travis Scott. For those who haven't heard of him, let us tell you a little bit about him. He's a rapper who first because of a record producer at the age of 16. His songs have won a BET Hip Hop Award and a Teen Choice Award, and rumors are he may be nominated for a Grammy this year.

Travis has worked hard on keeping Kylie's situation a secret — he has avoided questions at interviews and hasn't shared anything too cryptic on social media. We haven't heard too many secrets about Travis — except there are rumors that he isn't into becoming a daddy and has distanced himself from Kylie in recent months. For once, this part of the KarJenner family is actually pretty good at keeping secrets, so we'll have to wait for more confirmation before we figure out if this is true.

8 Tyga's Time

As good at Kylie seems to be at keeping secrets these days, that wasn't the case in her past relationship. Is it not surprising since she was barely legal — or was she? — when she started dating music artist Tyga. There was plenty of drama and a few secrets revealed about that romance, which included a weird love quadrangle since Tyga broke it off with his ex-girlfriend and baby mama Blac Chyna to date Kylie and Chyna ended up having a baby with Kylie's brother Rob.

First off, Kylie and Tyga say they weren't together before she turned 18, but it wasn't so much a secret that the two were definitely hanging out, especially since Tyga bought his girl a Ferrari for her birthday that year. There was also apparently a secret wedding a year ago New Year's, although we haven't seen any divorce papers. And Tyga also tried to imply on social media that Kylie's baby is his, which is understandable since she apparently got knocked up right after they broke up. We wouldn't be surprised if we found another Kylie/Tyga secret out soon, but for now, he's out of the KarJenner picture.

7 Tristan's Love Child

After the mess that Khloe had to go through with Lamar, all of us are ecstatic to see her so happy now in her relationship with NBA player Tristan Thompson. We're even more excited to know that she feels she is in a great position to start a family. She's always been the cool aunt, but we always suspected that she would also be a great mother.

The secret about her baby daddy, though, is that Khloe's baby isn't his only love child, and their child is actually pretty close in age to his half-sibling. Tristan's first child Prince just celebrated his first birthday in December. In fact, he was born after Tristan and Khloe started dating — and there were rumors that he was still dating baby mama Jordan Craig at the same time as Khloe. It's not a big deal these days to have two baby mamas, so we're hoping that's the only secret Tristan has up his sleeve.

6 The Other Kris

We have to go back to Kim for a minute since she has quite a number of men who are a major part of her history. We can't talk about the men behind the Kardashians without talking about her 72-day marriage to Kris Humphries. Kris is the third NBA player on our list so far, although there are a few more we could add if we had all day. And while he's been in the spotlight a lot, we still don't know much about him other than that he was a goofball who Kim loved and then hated days later.

One of the most interesting secrets about Kris Humphries is that he had another sport that he excelled at when he was younger. He was a swimmer who consistently beat out a young Michael Phelps before turning his attention to basketball. Otherwise, he wasn't very interesting, which explains why Kim bored of him so quickly. A lot of people thought that Kim and Kris's lavish TV wedding was all a sham, but Kris didn't seem to be in on it, since he wasn't willing to let go and let the divorce proceedings drag out while he reeled from a broken heart.

5 Reggie's Type

Another high-profile relationship for Kim was with yet another athlete, although this one started on the gridiron, not the basketball court. Reggie Bush was an NFL star just a few years removed from the Heisman Trophy when he met Kim and the two became one of the hottest Hollywood couples around. They were hot and heavy for a while; then they split up and got back together.

Reggie has a lot of secrets that got revealed, including the perks he was given as a player at the University of Southern California that were revealed during an NCAA investigation and lead to his having to give up his Heisman. He also has a type. Anytime Reggie has photographed with his family it feels like deja vu all over again, since his girlfriend (and mother of his three children) is an Armenian dancer who looks eerily like Kim. It's a little creepy but we're hoping that since they lasted so long that he is totally over Kim.

4 The Younger Brother

There is one man in the KarJenner family who grew up alongside his famous sisters. Rob was a bit of a side character in the beginning of Keeping Up, although he became pretty hot when he nearly won Dancing With the Stars. Then he became a bit of a hermit and apparently moved in with Khloe and Lamar but didn't want to be on TV. We all learned later that he gained a significant amount of weight and was pretty unhealthy. Then he met Blac Chyna and Rob became the Kardashian most likely to make headlines in 2016 and 2017, although he's started to fade back into the background in recent months.

There isn't a lot that Rob has kept secret from the world in the last couple of years, including baring it all when he would have fights with his girlfriend. He's still in trouble for posting naked photos of Chyna on social media, facing revenge porn charges. There are rumors that he had weight loss surgery last year, although we haven't seen photos in a while to know if anything came of it, and there have been other rumors that he has a secret son who was born in 2009. We don't know if those are true, but we thought we would give you a little more information about the Blac Chyna drama. Everyone knows that she has a child with Tyga, who was dating Kylie while she was dating Rob. But most don't know that Chyna also has a beef with Kim, as her best friend is Amber Rose, who previously dated Kanye. It was a mess from start to finish, that is for certain.

3 Kourtney's Young Flame

Most of the time that we've known Kourtney Kardashian, we've known her with Scott Disick. But the two broke up a while ago, and after a few flings, it seems like Kourtney has a new man in her life. She has called him her boyfriend, although there are more questions about her dating a 24-year-old than Scott being with an 18-year-old. The new man hasn't even been on Keeping Up yet, but we did some research to try to learn more about him.

Younes Bendjima is a former boxer originally from Algeria. He's got an international pedigree, and he splits time living in Paris, where his mom lives and the United States. We all know from the photos that Younes looks good, but the truth is that he is actually a model who has walked the runway for the top high-class fashion lines including Givenchy, Hermes, Burberry and Ralph Lauren. Most of the rumors about Younes that have come up are about Kourtney, and we know that she's been secretive about the romance. But so far he seems to treat her better than Scott did, and that might be all that matters.

2 The Star Of The Tape

OK, we've got one last man on our list from Kim's long list of conquests. He wasn't her first, for sure, but he is the one that helped put her into the national spotlight. Yes, we're talking about the star of the infamous sex tape, Ray J. He's the brother of Brandy and cousin of Snoop Dogg who has made a name for himself as a singer and actor but whose fame has never eclipsed where it was when Kim's tape started circulating.

Ray J starred in his own reality show a couple of years after the tape was released, trying to find love, and he also starred in a show with his sister that lasted a few years. He's gotten in trouble with the law a few times but has mostly stayed on the up and up. And now he's back on television, appearing in Love & Hip Hop with his wife Princess, who is expecting their first child. Ray J has brought some shade, especially with his song "I Hit It First," but our favorite secret about him is the way that he apparently tried to make it right by Kim. He allegedly sent a check with the amount of money he made off that sex tape to Kim as a wedding present, when she married Kanye.

1 The Producer

There's one final man that we have to put on a list of the men behind the Kardashians, and you may not think of him because he has remained in the background. But you have to give a lot of credit to Ryan Seacrest for putting the famous family on the route to stardom. Ryan is the executive producer of Keeping Up. Ten years ago, when he was 30 and a radio personality who had broken into television with American Idol, Ryan saw the potential in the crazy tale of the family and all their hijinks. People say they are famous for doing nothing, but Ryan said the talent where there was none, and he turned the struggles of sisters into reality television history.

In talking about the 10-year anniversary of the show, Ryan admitted that he loved watching The Osbournes and he wanted to emulate it with another interesting, relatable-but-not-so-relatable family. He certainly got a zany bunch with Kourtney, Kim, Khloe, Rob, Kendall, and Kylie, not to mention Kris and Caitlyn. There have been spin-offs and specials, and the family has built an empire through social media and other businesses. Without Ryan, they wouldn't be where they are today.

Sources: People, Daily Mail, E! Entertainment