Family Fun #vacation #muchneededvacation

A photo posted by Molly Sims (@mollybsims) on Dec 12, 2014 at 10:12am PST

Baby on board! Pregnant Molly Sims showed off her growing baby bump and fit physique while on vacation with her husband Scott Stuber and their 2-year-old son Brooks in the Bahamas on Monday, Dec. 29.

Wearing only a teeny black bikini, sunglasses, and hat, the model put her growing belly on full display. “Family Fun #vacation #muchneededvacation,” the soon-to-be mom of two captioned the photo, in which her boys don swim trunks.

 

“Ummm just arrived to Heaven #bahamas #vacation,” the expecting star, 41, captioned an equally gorgeous scenic shot on Dec. 26, one day after spending Christmas with her adorable family. 

The lifestyle blogger has been working hard to keep herself in shape while pregnant with her second child. “Working on my pregnant buns of steel! @nancyrose performance @tremaineiac Emily is killing me!!” she wrote alongside an Instagram picture of herself on a Pilates reformer in November.

Working on my pregnant buns of steel! @nancyrose performance @tremaineiac Emily is killing me!!

A photo posted by Molly Sims (@mollybsims) on Nov 11, 2014 at 5:51am PST

Sims announced she was expecting baby No. 2 with a sweet snap via her WhoSay account this past September. In the photo, the busy mom held a chalkboard which read “4 months,” while Brooks held one which read “2 years.”

"I can't even [begin] to explain just how excited we are for a new baby. We are so, so, so blessed as a family, and I'm speechless at the fact that we have the opportunity to bring a second bundle of joy into the world," Sims shared with followers. "I absolutely cannot wait to see what life will be like as a mother to a toddler and a newborn, and I really can’t wait to see Brooks as an older brother to Baby #2!"

"I just know that he's going to be preciously protective," she continued about her lil tot. "If it's a girl, he'll be her biggest supporter and confident and if it's a boy, I know they'll be the best of friends, always getting into adventures together." 

Sims married Stuber, a producer, in September 2011, after dating for over a year.