Celeb bump day: Molly Sims, Vanessa Lachey, Maci Bookout, Paulina Gretzky

Pregnant Molly Sims gave us serious vacation envy with this sunny snapshot of her and her husband, Scott Stuber, with their 2-year-old son Brooks while on vacation in the Bahamas.

"Family Fun #vacation #muchneeded," the 41-year-old actress captioned the photo, as she shows off her baby bump in a cute black bikini.

Sims announced she was four months pregnant in September, which puts her around the seven-month mark currently.

The mom-to-be shared another beach snapshot wearing a colorful cover-up.

Sims recently revealed her secrets to her fabulous maternity style. "Don't be afraid to wear bold colors. Being pregnant doesn't mean you have to employ the wearing-all-black tactic; you should celebrate your burgeoning bump!" she wrote on her blog on TheBump.com. "When dressing bold, keep your makeup simple with a pop of color on the lip. That lip color will help you brighten your face and your overall look, especially during the winter months when we tend to look pale."

Next up: Pregnant Vanessa Lachey's adorable Christmas card

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Vanessa Lachey shared a picture of her Christmas card on her Instagram page, in which her husband, Nick Lachey, is kissing her baby bump while their son, 2-year-old Camden, rests on his shoulders and kisses his mom.

"This photo was taken on Camden's birthday and it's my favorite picture of all four of us…at least, so far!" she wrote on her website.

They are expecting their baby girl within the next month or two and she recently told American Baby during her gorgeous photo shoot that, unlike her first time being a parent, she knows that worrying is a waste of time. "Once Camden was born, certain fears calmed down. I no longer thought, Will I be able to do this? My instincts really did kick in. We stumble and make mistakes, too, but that's what learning is. That's the beauty of it."

Next up: Teen Mom's Maci Bookout pregnant again — how far along is she?

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Teen Mom star Maci Bookout already has a 6-year-old son named Bentley with her ex-boyfriend — and now the reality star is expecting her second child with her boyfriend of two years, Taylor McKinney.

The 23-year-old is reportedly 16 weeks pregnant and she accidentally let the baby's gender slip when talking to In Touch magazine.

"This baby is such a blessing. I'm calling her my miracle baby," she said. "I knew my chances of getting pregnant were very low."

Bookout said the pregnancy was a "huge shock" because she has polycystic ovary syndrome, which can make conceiving a child difficult.

"This time I'm able to be excited because I'm older and able to give my baby the stability of the relationship that Taylor and I have," she said.

Bookout also revealed her strange early pregnancy symptoms that made her suspect she was pregnant again.

Next up: Golfer or hockey player? Paulina Gretzky is having a boy

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Paulina Gretzky shared this gorgeous holiday picture on her Instagram page as she poses with her fiancé, professional golfer Dustin Johnson, and her brother.

Gretzky, who is the daughter of hockey great Wayne Gretzky, also revealed that they are expecting a baby boy.

"Merry Christmas Everyone! Ps…We're having a BOY," she captioned the photo.

This begs the question: Will he be a golfer or hockey player? "Either one would be great," Johnson told reporters when he was asked.

Gretzky recently celebrated her baby shower and was gifted with several Pottery Barn items, including a $1,100 changing table and an $800 crib, as well as a onesie that said, "My daddy golfs better than your daddy."

Next up: Carrie Underwood's growing baby bump

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Pregnant Carrie Underwood's baby bump stole the show as she posed with a group of friends at the Opry. "Always love it when I get the chance to hang out with such talented people," she captioned the photo.

The singer and her husband, professional hockey player Mike Fisher, are expecting a baby boy in early 2015 and she recently said that she plans on slowing down a bit once the baby arrives.

"Right now, my schedule and my husband's hockey schedule kind of dictate our holidays," she told Taste of Country. "I told him recently, 'You know, I'm really tired of skipping holidays. So from this moment on, I think it's just so important no matter where we are or what we're doing, we have to make it special.' And, I think that's going to be our tradition, and I hope that my kids later in life are going to be like, 'Mom always tried to make that special even if we were crazy someplace or dad was off playing hockey or something like that.'"

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