Matt Damon and his wife Luciana are expecting another baby, his rep confirms to UsMagazine.com exclusively.
His rep tells Us, "Everyone is excited."
Damon, 39, and Luciana, 34, are parents to Isabella, 3, and Gia, 21 months. Luciana has a daughter, Alexia, 11, from a previous marriage.
Damon -- who quietly wed Luciana at NYC City Hall in December 2005 -- has credited his kids with keeping him grounded in Hollywood.
"It's pretty easy to kind of lose your way... having kids is really helpful," he told Parade magazine. "They kind of disabuse you of the notion of your greatness pretty quickly. There's a routine that you get into with kids that precludes you from going back to your single days. I'm probably more boring than I used to be. I go to bed earlier and I get up earlier."
He said he hopes his daughters take after their mother. "My wife is a very wise and a very thoughtful person. Hopefully, they'll inherit that," Damon said.
Added the actor (who supports charities including One, which fights AIDS and poverty in third world countries): "From me, I hope they'll inherit a sense of social justice and a desire to continue some of those programs that I'm involved with. Maybe not those exact ones, but hopefully, something to further social justice."
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