There are no set rules about the best time to have another baby, especially when it comes to celebrities. Celebs are always under the microscope and there is nothing more exciting to report on than a new famous baby bump. From the Kardashian Klan (see what I did there) to the infamous Casey Anthony - We have all the scoop on who's going to be showing off their new baby bumps! We wouldn't be surprised to hear a pregnancy announcement from these particular celebs any day now.

However, having one child easily doesn't always mean the second - or in Michelle Duggars case the 20th- will come as easy as the first. Parenting.com reported that a full 15 percent of couples trying for their second child have fertility problems. Sandra Ann Carson, M.D., a reproductive endocrinologist in Houston and president of the American Society for Reproductive Medicine says, "Secondary infertility is as much of a problem as primary infertility." There may be a problem, such as irregular ovulation, or new conditions, too, can pop up between pregnancies, such as declining ovarian function, blocked fallopian tubes, low sperm count or motility, and one of the most significant factors - age. But, age isn't going to stop celebs like Janet Jackson and Nicole Kidman from trying!

Keep reading to find out which celebs are longing for another baby in their lives. Some of them are showing all the tell tale signs that another baby is on the way, and some entertainers are announcing their plans for more children on stage. We know these celebs are trying for another baby.

12 Kim Kardashian West

In March, a Keeping Up With The Kardashians promo clip showed Kim announcing to her family that she and husband, Kanye West, were going to try for baby number three. Doctors warned Kim that it was not safe for her to be pregnant again because she suffered from placenta accreta during her last pregnancy. Placenta accreta is a condition in which the placenta grows into the wall of the womb and prevents it from easily detaching at the time of birth. This condition affects five percent of women giving birth.

On June 21, a source confirmed to PEOPLE that the couple has hired a surrogate to carry their child. Kim began considering a surrogate after two doctors told her it would be unsafe for her to get pregnant again. She also spoke to a mother who used a surrogate in addition to giving birth herself to talk about her fear of not loving the child the same.

“I’ve come to the conclusion in my mind that I can’t carry another one. So now I want to explore surrogacy,” Kardashian West told her mother, Kris Jenner, on the show.

Both sister Khloé Kardashian and Chrissy Teigen have previously offered to act as Kardashian West’s surrogate.

11 Adele

Late last year, Adele stood on stage in Nashville and announced to the world that she wanted another baby. "My womb is starting to ache a little bit," she told the crowd. "It's like, 'Baby, baby, baby. Need a baby, need a baby.' I'm not pregnant. I won't get pregnant until the end of the tour."

According to an article published in Life & Style Magazine in April, “Adele is planning on having a second child and is actively trying to get pregnant,” a source said of the British star and her husband Simon Konecki.

Adele thinks California will be the perfect place to raise her growing family. The tabloids are watching her like a hawk for a tell tale sign of pregnancy. There have been rumors that Adele has given up some of her favorite indulgences like sushi and wine. We are all anxiously awaiting the baby number two pregnancy announcement from Adele!

10 Mila Kunis

Mila Kunis and Ashton Kutcher are reportedly "not done" expanding their family. They welcomed their second child, Dimitri, into the world this past November. Not even a month later, the pair let the world know that they were already thinking about baby number three.

“I’ve always said this, I think you know when your family is complete,” Mila told Ryan Seacrest on his radio show soon after the couple had announced the second pregnancy. “After we had Wyatt, the second that I gave birth, I was like, ‘I know that we need to have another baby. We both knew it, we just felt it. And so I always say after the second one, we’ll know if we need to have another one. I really do believe you know when your family is complete.”

A source claimed to HollywoodLife.com, "Ashton and Mila are not done in the baby making department, and she is eager to start again sooner than Ashton might be ready himself.” The source added, "They want a big family, and she feels the sooner the better. As much as she likes to act, she is okay with doing voiceover work to substitute the time to have even more family. So don't be surprised when she gets pregnant again."

9 Kerry Katona

The Atomic Kitten singer, Kerry Katona, already has kids Molly, 15, Lilly, 14, Heidi, 10, and Max, 9, from past relationships, and three-year-old Dylan-Jorge, aka DJ, with her husband George Kay. Now that the couple's marriage is back on track they are ready to have another child. This will be baby number six for Katona!

In an interview with the new issue of OK! Magazine, Kerry said, '' George is desperate for another child. I'll have one more and that's your lot. We are [trying for another]. We haven't been careful, put it that way. I'll be more than happy to find out I'm pregnant. Although I'm loving how my body is right now and I have worked so desperately hard to get this body.''

The singer has made it known that she was “born to be a mum.” She frequently posts pictures on Instagram of her children stating, “family is everything.”

8 Nicole Kidman

According to OK! Magazine, Nicole Kidman and Keith Urban, both 49-years-old, are allegedly trying for baby number three. Despite her age, Nicole revealed in a recent interview that she still hasn’t given up on the idea of expanding her family, she also surprisingly revealed that “something may happen” sooner than fans may expect! “Keith and I would love to have more babies,” Kidman said. “I still have the faintest hope that something may happen to me this year [2017].”

The couple is actively trying for another baby. An insider for the magazine publication revealed, “She’s been using ovulation kits to track her cycle. But beyond that, she’s very spiritual. She just has faith that it can happen.”

Kidman has felt that this may be her last chance for another baby. Around age 50, women typically experience menopause, a decline in function of the ovaries. Kidman said, "Well, my grandmother had her last baby at 49. So, you never know."

7 Joseline Hernandez

The Love & Hip Hop: Atlanta star, Joseline Hernandez, has just given birth to a daughter, Bonnie Bella, with R&B artist Stevie J. She is already longing to start trying for baby number two. “Joseline loves Bonnie B with all her heart and she’s eager to have another baby,” a source close to Hernandez says.

“She’s still mad at Stevie for being completely absent from her life when she was pregnant. It hurts like hell that he wasn’t there to comfort her, bring her food, take her to her doctor’s appointments and all of those intimate things that a man’s supposed to do for the woman who’s carrying his child.” The source added.

“She didn’t have the experience with him and she wants that,” the source continues. “She’s young and in the prime of her life and career and could handle another baby!”

Hernandez now sees Stevie J as “a good man, a great father and a great provider” and reveals that she can “see herself having another baby with him and possibly spending the rest of her life with him.”

6 Gwen Stefani

Gwen Stefani and Blake Shelton are desperately trying to conceive a little girl. Life & Style has reported, Blake and Gwen have turned to IVF to try to make it happen. Unfortunately, so far, they have failed in conceiving a child. The magazine reports that the pair is also considering adoption if Gwen doesn’t become pregnant by the end of 2017.

“They will absolutely pursue adoption,” the insider says. “It might be a baby, or it might be a toddler. But no matter what, they want a little girl in their arms by the end of 2017.”

“Gwen would love to have another child with Blake,” a source close to the couple revealed. “He’s not pressuring her at all, but she knows it’s something he would love too.”

Stefani already has three children with her ex husband, but they are all boys. She knows it will be hard to conceive at age 47, but she has been inspired by others to keep trying.

“She isn’t focused on it obsessively, but seeing Janet Jackson have a healthy baby at 50 has inspired her to open her mind more to the possibility. It’s made her start to see it as something she and Blake really could make happen,” the source adds.

5 Michelle Duggar

The 19 Kids and Counting star, Michelle Duggar, just can't stand being stuck on an odd number of children. Michelle Duggar was pregnant with a 20th child in 2011, but she miscarried on December 11. Their 19th child, Josie Brooklyn, was born premature at 25 weeks, and she only weighed a little over one pound. Michelle could be putting her own life and that of her child at risk if she does get pregnant again because she has had problems with her last two pregnancies.

During a 2015 interview with The 700 Club, 49-year-old Jim Bob Duggar and 48-year-old Michelle Duggar revealed that they are still trying for another baby. In fact, Michelle hinted that they want more than one more by using the plural “children” while talking about their future family plans. Two years later, no baby, but they will always be trying. Jim Bob realizes that they might not be able to have any more children, but Michelle Duggar is available for him whenever he feels like trying. The Inquisitr reported, one of Michelle’s sex tips for daughters Jessa and Jill Duggar is to never say “no” to their husbands.

4 Kourtney Kardashian

Kourtney Kardashian and Scott Disick have shown us the good, the bad and the ugly parts of their relationship. In one episode of Keeping Up With The Kardashians Disick jokes that Kourtney only has sex with him once every few years, and when she does - she gets pregnant! We were all thinking the same thing when the on again off again couple announced they were back on - When is baby number 4 coming?

Back in January, Kardashian posted a video to her website where she organized her ridiculously neat pantry and dropped a hint that she could be expecting baby number four in the future. While cleaning out some books, her friend grabbed a recipe book about cooking healthy for youngsters and asked her, “You’re not having any more babies, right?” Kardashian grabbed it back from the throw-away pile to say, “You never know!”

We predict it will only be a matter of time before Kardashian and Disick announce that baby number 4 is on its way!

3 Lauren Silverman

American actress and wife to Simon Cowell, Lauren Silverman, opened up about wanting another baby in 2015. At that time their son Eric was only 15 months old. The couple revealed their plans to grow their family, and admitted they want their son to have a sibling, more particularly, a sister.

"When I was pregnant with Eric I was told by the doctors he was a girl," Silverman says. "But he just fooled them. There were a few names floating around but we had our name picked out and it would be lovely to have a girl." She jokingly adds that she sees potential trouble for a daughter as she grows up. "The only problem is that I will feel sorry for her when she is older because she won't be able to leave the house, and no man would dare come near here because Simon would be so protective."

2 Catelynn Lowell

Teen Mom OG star, Catelynn Lowell, has been very open about her sever struggles with mental health. It was hard for her to bounce back into a routine after having baby Nova in 2015. She struggled with postpartum depression and awful anxiety. She announced that they will really start trying for baby number 3 next year because she wants to focus on her mental health right now.

“I’ve definitely been thinking about it and that’s the one thing that’s holding me back, honestly. Especially because they say if you’ve had postpartum once, you have a higher chance of getting it with your next,” says Lowell. “With Nova, I thought it was severe because I struggled with anxiety already and panic attacks and depression. So that is definitely the thing that scares me the most. I want to have a big family and have a lot of kids, but it’s scary. It’s definitely scary.”

1 Casey Anthony

Casey Anthony is open to having another baby. In fact, there are pictures of her looking as happy as can be holding her friend's baby. The photos were taken back in February and Anthony is smiling from ear to ear. She is seen playing toys with the baby at a Florida restaurant. The infant is the grandson of a veteran NBC producer who has gotten close to Anthony. The six month old was handed over to the woman who was acquitted of killing her child and they ate lunch together. Anthony and the baby were also seen together at her home before the public luncheon.

Casey insists she still has no idea what happened to Caylee 9 years ago. Anthony said, "I've been tested, I've gone through the psychological evaluations, I've talked about this to the point where I've been in a puddle not being able to talk about it for days afterwards." She still feels joy when she is around children and she hasn't ruled out having another one.

Sources: Life&Style Magazine, Hollywood Life, MSN, PEOPLE, Inquisitr