January 05, 2015 11:40 AM

Molly Sims got her wish!

The model is expecting a daughter with husband Scott Stuber, she announced Monday on social media.

“It’s a girl!!!” Sims, 41, captioned a snapshot of herself cradling her belly and holding a giant bouquet of pink balloons.

“We couldn’t be more excited,” the mom-to-be, who wore a bright pink dress for the photos, wrote on her website, adding that Brooks Alan, 2½, is “going to be the very best big brother ever.”

Courtesy Molly Sims

And although The Everyday Supermodel author told PEOPLE in November that she was worried about adding another baby to the mix, the actress admits she’s just counting down the days until her daughter’s arrival.

“Overall, I have to say I’m much more relaxed with this pregnancy. To be honest, I’m incredibly excited, slightly scared and a tiny bit anxious all at the same time,” Sims writes. “As this is my second time around the block, there is no fear of the unknown.”

She adds, “I also think because I spend a lot of my day chasing Brooks around, there isn’t as much time to truly wrap my mind around the fact that our lives will be turned upside down (in a good way!) very shortly.”

The only thing left to reveal? The couple’s name choice. “Now the question is, what do you think we’ll name her?” Sims teases, asking fans to leave their best guesses.

IT’S A GIRL!!! http://t.co/USXH0PsPmU pic.twitter.com/TSPPyWImoJ

— Molly Sims (@MollyBSims) January 5, 2015

— Anya Leon

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