Molly Sims and her husband Scott Stuber have welcomed their second child together — get the details! Credit: Kevin Mazur/VF15/WireImage

Mama Molly now has a little girl! Molly Sims and her husband Scott Stuber have welcomed their second child together, the proud mom annouced on Instagram on Thursday, March 26. 

"We welcome Scarlett May Stuber into our family," she captioned a sweet photo taken by Gia Canali of her mini-me. "Our hearts are bigger with you here." Sims' adorable little girl was born on Wednesday, March 25. 

Sims, 41, revealed in September 2014 that she and the producer were expecting another baby. The couple, who wed in September 2011, are already parents to 2-year-old son Brooks.

"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 wrote via WhoSay at the time. She added: "I just know that [Brooks is] going to be preciously protective."

One month later, Sims announced that Brooks would be getting a sister. "We couldn't be more excited," she captioned a pic on her blog, as she showed off her growing baby bump. "I can't wait to meet our baby girl and I just know that Brooks is going to be the very best big brother ever. Two kids under three … here we GO!"

Before her daughter's arrival, the Las Vegas alum was the guest of honor at an L.A. baby shower on Feb. 7. She was feted by famous pals such as host Shannon Rotenberg, Vanessa Lachey, Ali Larter, Rachel Zoe, and actress Sara Foster.