"Is she pregnant?" When Kylie Jenner started acting sly in 2017, everybody was wondering if there was a bun in the oven. Now that Stormi has celebrated her first birthday, Kylie Jenner's little girl is basically the most famous kid on the planet. She's also one of the cutest.

Kylie was just 20 when she became pregnant. Travis Scott has told Rolling Stone that he will be proposing to her "in a fire way." The youngest Kardashian-Jenner isn't the only one to have gotten pregnant young. Teen Mom basically exists to chronicle the lives of girls who became mothers sooner than expected.

Most moms plan their pregnancies. They meet the love of their life, they possibly get married, and the pregnancy will come "when it's right." Of course, that isn't always how it works.

Cardi B has admitted that her pregnancy wasn't planned. Amazingly, so have some of the most "mom" celebs around. Kourtney Kardashian? Everyone basically associates her with motherhood, but she too has confessed that not all of her kids were planned.

Getting pregnant sooner than expected — it's what celeb magazines live for. It can fill gossip columns, top headlines, and the celebrity will 100% be in the spotlight. Some celebrities seem to have gone down a more traditional route. Justin Timberlake and Jessica Biel got married first. So did David and Victoria Beckham.

This list will be looking at the #unexpected. From reality moms to music stars, it's time to take a closer look at major female celebrities who really did get pregnant sooner than expected.

20 CATELYNN LOWELL: KIND OF WHY IT'S CALLED 'TEEN MOM'

Catelynn Lowell is now world-famous. She also just had her third baby. Things weren't always so planned for this Teen Mom star, though. At just 16, Catelynn and Tyler Baltierra found themselves expecting a child. Their trials and tribulations of teen pregnancy were the basis of the show, 16 and Pregnant, and it was definitely unexpected.

They weren't "prepared to raise a child," Business Insider reports. In fact, Caitlynn and Tyler "placed their child" with another couple. Caitlynn is now a grounded mother and a role model. Back in the day though, this Teen Mom cast member was definitely experiencing the unexpected.

19 KOURTNEY KARDASHIAN: 'IT WAS NOT A PLAN'

In 2014, Kourtney Kardashian announced that she was expecting her third baby. This "OG" Kardashian mom has basically made a household name out of motherhood– it wouldn't be Keeping Up With The Kardashians without Mason, Penelope, and Reign running around the house. As The Metro reports though, Kourt admitted that the pregnancy wasn't planned.

"It was not a plan," Kourt told Scott Disick on the show as she revealed her pregnancy at the end of an episode. While it wasn't her first baby, Kourtney still found herself in the position of having that stick turn pink (and not expecting it). Kourtney is now co-parenting with Scott.

18 JAMIE LYNN SPEARS: 'I FOUND OUT I WAS PREGNANT IN A GAS STATION'

Jamie Lynn Spears is now a mom that people look up to. Fun, loving, and with kids growing up fast, the younger sister to Britney Spears comes with a #mom. As The Huffington Post reports though, Jamie-Lynn's pregnancy didn't come expected.

"We didn’t want to do it at home, so I went in the BP [gas station] and I took a pregnancy test. I sat on the thing, and we were sat there looking and my friend looks down and she freaks out and I was like: What? What? What?"

Jamie Lynn was 16 at the time. Now a responsible mother and a famous celeb, it was nonetheless a tricky start for this mom.

17 KHLOÉ KARDASHIAN: HADN'T FULLY SUSSED THIS GUY OUT YET

Khloé Kardashian is now officially a solo mother. Following the Jordyn Woods drama that made global headlines in February 2019, Kim Kardashian referred to her sister as a "solo mother," E Online reports. Tristan Thompson is the baby daddy, but he's hardly reliable.

Khloé was 34 when she became pregnant. While that is by no means young, the fact that Khloé may not have fully sussed Tristan out is what places her on this list. True arrived in 2018. Khloé already went through drama days before she gave birth. While the love for her baby is #enormous, Khloe's pregnancy itself feels a little unexpected, in hindsight.

16 MACI BOOKOUT: SO SCARED, 'TWO SECONDS AWAY FROM DRIVING TO FLORIDA'

Maci Bookout now has millions of social media followers. The Teen Mom star fronts PCOS campaigns, she's a Teami Blends partner, and her kids are kind of celebs themselves. Bentley was Maci's first baby, although she now has three kids. It was a teen start for Maci and an unexpected one. As E! reports, Maci got honest:

"I was two seconds from, like, getting in the car and driving to Florida or something. I knew for about a month before I told them," Maci said about telling her parents. She was too scared to tell her mom. Likewise, her dad. In the end, Maci told her brother first.

15 CARDI B: TOTAL SURPRISE, BUT IT'S OFFSET'S FOURTH

Anything Cardi B does makes a headline. First, it was for her honest rise to fame. Then, everyone found out about Cardi's down-to-earth personality. In 2018, Cardi became a mom to Kulture (although this baby has mostly been kept out of the spotlight). Seemingly reunited with Offset, Cardi and her baby seem more settled than in late 2018.

"No, it wasn't planned, it was just one night. It was a good night. It had to be that night," MSN quotes Cardi saying about her pregnancy. Now 26, Cardi was 25 when she found out she was expecting. Talk about a celeb who is acing motherhood! Offset has four kids now.

14 KYLIE JENNER: EXPECTING STORMI 'WEEKS' INTO DATING TRAVIS SCOTT

Kylie Jenner and Travis Scott are now so #solid, nobody is questioning the pregnancy anymore. At 21, Kylie is now the world's youngest billionaire, as BBC reports. She's front-page news with everything she does (and Stormi tags along). The Daily Mail reports:

Kylie was expecting Stormi "three weeks" into dating Travis. “We felt like: This is something special. And kids are something we kind of talked about when we were getting busy.”

As per his Rolling Stone interview, Travis himself admitted that they were expecting Stormi within "weeks." Kylie was just 20. She has no regrets (and nor do we). Still, it was very unexpected.

13 BLAC CHYNA: FOUR MONTHS DATING ROB KARDASHIAN, #PREGNANT

"The couple have been dating since January and recently announced their engagement." When The Daily Mail reported Blac Chyna's pregnancy back in 2016, the newspaper noted that the relationship was just four months old. Blac Chyna and Rob Kardashian had baby Dream, but nobody was expecting it.

There's a bit of a circle going on with this girl. Chyna has a baby with Tyga (he was just 22). Tyga then dated Kylie Jenner. Chyna returned to the family by dating Rob Kardashian. Now, a solo mother or two, Chyna is co-parenting. Still, nobody saw it coming this fast. While we saw these two on Rob & Chyna, the show was eventually axed.

12 REESE WITHERSPOON: 'NO ONE ELSE WHO WAS 22 HAD A BABY'

If you're old enough to remember her huge hit in the '90s, you'll remember the on-screen couple who turned real-life sweethearts. Reese Witherspoon and Ryan Phillippe had young love, and as it turns out, their first child wasn't planned at all.

“Ava wasn’t planned and suddenly I was faced with the prospect of becoming a mother and I had never even held a newborn in my arms before!" Reese added: "No one else who was 22 had a baby."

Speaking to Parents candidly about becoming pregnant in her early 20's, Reese admitted that the prospect was daunting. Her first-born, Ava is now a teenager and joined by two other children.

11 KIM AND KANYE: SHE WAS PREGNANT FOUR MONTHS INTO DATING

We've kind of reached the point where Kim Kardashian and Kanye West get #legendary. Proving us wrong since 2012, this mismatched couple are now ruling Hollywood, and baby number four is due in May 2019. The original "Kardashian baby name" came with North West in 2013, but nobody saw it coming.

Kim and Kanye dated for two years before getting married in 2014. "It's true!! Kanye and I are expecting a baby," Kim wrote on her blog just months into her relationship with Kanye. As This Is Insider reports, May 2012 was the official "dating" time. By December though, Kim was pregnant. #NoRegrets

10 LEAH MESSER: TWO MARRIAGES BEFORE THE AGE OF 20, 'WE WERE SCARED'

Before fame, Leah Messer was a regular teen from Elkview, West Virginia. At 17, Leah found herself pregnant, and 16 and Pregnant is now #TeenMom. This girl's pregnancy came unexpected, but Leah has also been married twice under the age of 20.

Leah married Corey Simms at 18 back in 2010. They divorced in 2011 after an infidelity admission from Leah. By 2012, Leah had married Jeremy Calvert. "We were scared because we didn't know what her future was going to look like, but we always pushed for answers," Leah told In Touch about her daughter's muscular dystrophy. Another mom who got pregnant sooner than expected.

9 SOFIA VERGARA: PREGNANT AT 19, 'I WAS REALLY YOUNG WHEN I DIVORCED HIS FATHER'

Times have changed. The show that has made Sofia Vergara an international star is called Modern Family. Back in her native Colombia though, mentalities weren't so flexible back when Sofia found herself a young mother at the age of 19.

"When I had Manolo, I was 19, and I had the energy for everything," Sofia told Redbook. Sofia had married her high school sweetheart, Joe Gonzalez, but they got divorced only a year after Manolo arrived. This solo mom had it tough, but she never lost her spirit. Sofia wasn't famous yet, but the pregnancy likely came unexpectedly this early in her life.

8 BRITNEY SPEARS: IT ALL HAPPENED VERY FAST

In a way that's seen throughout the South, getting pregnant in your early 20's isn't outside the ordinary. Britney Spears was already a major star by the time she and Kevin Federline were expecting their first baby– yeah, that guy. Britney was 23.

"I've had a full-time job since I was 16, have traveled around the world and back and even kissed Madonna! The only thing I haven't done so far is experience the closest thing to God and that's having a baby. I can't wait!" Parents reports Britney writing on her blog. The age wasn't what got everyone here. It was how quickly things had moved with K-Fed.

7 BEKAH MARTINEZ: SEVEN MONTHS INTO DATING, 'I WAS IN DISBELIEF'

Bekah Martinez was already making headlines for being one of the youngest contestants The Bachelorette had ever seen. While Bekah didn't pursue her on-screen man, she did make headlines in 2018 for having a baby. She had been dating her boyfriend for just seven months. She told Pure Wow:

"I was in disbelief and thought: Is this really happening? I immediately called Grayston and then went across the street to the Dollar Tree and bought two more pregnancy tests. They, of course, were both positive."

Bekah has since given birth and is enjoying motherhood. Still, after seven months, that one came unexpectedly.

6 FARRAH ABRAHAM: #TEENMOM AND A DAD WHO NEVER MET HIS DAUGHTER

Slam Farrah Abraham all you like. This Teen Mom star has had it tougher than anyone ever should. Farrah appeared on 16 and Pregnant with a baby daddy she was hoping would be in her child's life. It all came to a very tragic end when Derek Underwood lost his life in a car wreck.

“Definitely lived on the edge, but he was responsible, he went to work, came home," Derek's sister said about her brother, as Style Caster reports. Farrah gave birth to Sofia as a solo mother, and this little girl never got to meet her father. A moment of respect for Farrah.

5 MEGAN FOX: ALL THREE BABIES WERE A SURPRISE

Megan Fox used to be mocked for being a bit of an Angelina Jolie lookalike. With similar features and the tattoos to match, Megan is the Transformers actress who has risen to become a major celeb parenting authority. She has three children with Brian Austin Green.

“The producers would come see me in the morning in the makeup trailer and I would be clinging to a box of saltines. We kept pickles in the refrigerator for me and I was just constantly on the verge of [being sick],"

Megan told Ellen in 2014. Megan admitted that all three of her pregnancies were a surprise. She "didn't see it coming," People reported as it covered Megan's Ellen appearance.

4 CANDACE CAMERON-BURE: ONLY 22, NOW A LITERAL 'FULL HOUSE'

There's a touching irony to a Full House actress now having a literal "full house." Candace Cameron-Bure is the celeb mom of three who started motherhood fairly young. She was just 22. In 2018, The Daily Mail ran an entire feature – not on Candace's pregnancies, but on the "secret" to her 22-year marriage.

"You really try to, I always say, put your spouse on a pedestal," she said. "And in return, you're hoping, which my husband does, we have the same respect for one another other." Interesting take! Nobody expected this star to get pregnant that quickly, though. Full house, indeed.

3 AMBER PORTWOOD: A TEEN MOM WHO BATTLED DEPRESSION

Much like her fellow Teen Mom cast members, Amber Portwood is yet another mother for whom pregnancy came as a giant surprise. Teen years are generally spent battling breakouts and freaking out over Prom. Not for Amber. 16 and Pregnant showed this girl with a bump, although motherhood has had more challenges for Amber.

Speaking about post-partum depression, Amber told Dr.Drew: “It went from taking care of James so amazingly to one night I had to give him to Andrew. I couldn’t, I don’t know what happened. I’ve never felt anything like it, I never felt like that with Leah. It started feeling like a weird pressure, like I could explode.” We truly wish Amber all the best.

2 SNOOKI: 24 YEARS OLD, 'I WAS WORRIED'

Snooki is now a household name. Nicole "Snooki" Polizzi didn't exactly come with a parenting streak back on Jersey Shore, but with her third on the way, this girl is totally Jersey Shore: Family Vacation now. Snooki was 24 when she and Jionni LaValle were expecting their first.

Yes, she was young. Mostly what surprised everyone though, was how this party girl had found herself on the path to motherhood. In 2018, Snooki told People that she had been "worried" about being able to conceive more children. Everything seems to have worked out for this mom, but that first pregnancy was sooner than expected.

1 LAUREN BURNHAM: A PREGNANT BACHELORETTE BEFORE SHE TIED THE KNOT

Bachelor Nation contestants can become celebs overnight. Lauren Burnham is another lucky lady who now finds herself both married and pregnant. This engagement pic came before the bump was visible, but Lauren was expecting.

“Have you ever seen anything more beautiful?” was Arie Luyendyk's IG caption in 2019 as he posted a pic of his soon-to-be wife with a bump. The couple did post an April Fool's pregnancy joke (which they later apologized for), but these two have definitely moved fast. Becca Kufrin was Arie's original lady, but he found his true love.

Admit it – Kylie Jenner? Those Teen Mom ladies? Jamie Lynn Spears? Nobody expected them to get pregnant that quickly.