Molly Sims is going to be a mommy of two!

The 41-year-old model-actress, who rose to prominence for her appearances in the Sports Illustrated Swimsuit issues and her role as Delinda Deline in the NBC drama "Las Vegas," announced that she is pregnant with her second child with film producer Scott Stuber Tuesday, Sept. 30 on her website MollySims.com.

"I am BE-yond thrilled to share some very special news with you!" wrote Sims. "Scott, Brooks, and I are welcoming a fourth member to our little family - our second child!"

"I can't even being 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," she continued. "As a new mom to Brooks, an entire world of motherhood opened to me along with a thousand and one questions. 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!"

Sims and Stuber, who tied the knot in September 2011 at the Frank Cafferata Vineyard in Napa, Calif., welcomed their first child Brooks Alan in June 2012.

"I just know that he's going to be preciously protective," Sims said of her 2-year-old son. "If it's a girl, he'll be her biggest supporter and confidant and if it's a boy, I know they'll be the best of friends, always getting into adventures together."

Speaking at the Gymboree and Eric Carle Collection Launch Event And Book Reading in Los Angeles on Sept. 5, Sims told Us Weekly that she and Stuber, who is currently filming "Ted 2," were wanting to have another child.

"We are trying! Which kind of is the fun part of it, I'm getting ready," she said at the time. "[Brooks] just turned 2. We decided to wait because I really wanted to enjoy him."

"It's just so fun ... you become a kid again!" she told People of trying for another child.

Sims also took to Twitter to share the happy news with her 74,700 followers. "Scott + Molly + Brooks + BABY makes 4!" she wrote on the microblogging site along with a photo of her and Brooks holding up chalkboards that read "4 months" and "2 years."