Molly Sims pregnant with third child: 'I can't believe it!'

LOS ANGELES, Aug. 9 (UPI) -- Model and actress Molly Sims is expecting baby No. 3.

The 43-year-old former Las Vegas star confirmed as much in a tweet Tuesday after news of her pregnancy broke earlier in the day.

"That's right! Baby Stuber #3 is on its way! #blessed #grateful #icannotbelieve it," she wrote.

Sims followed up by posting an emotional video on her YouTube channel that first appeared on People. She and Stuber are already parents to 4-year-old son Brooks and 16-month-old daughter Scarlett.

"It's a Hail Mary!" the actress told the magazine. "I'm so happy -- we're so blessed. We were so shocked, but we're thrilled."

"We never expected it would happen. This is such a true surprise," she added in the video. "We are so happy that he or she, whatever you are in there, is here and we're excited to share this journey with you."

Sims and Stuber, a film producer, married in Calistoga, Calif., in 2011 and welcomed Brooks the next year. The actress had told People in June that having two children has made her home life "very busy."

"Having two kids is definitely a game-changer," she admitted before adding, "[But] I had much more trepidation with Brooks because I didn't know what I was doing."