Charlie Sheen and Brooke Mueller

This news will probably make Denise Richards‘ head explode!

Charlie Sheen and his wife, real estate investor Brooke Mueller, are expecting their first child together.

“Brooke and I are thrilled!” the Two and a Half Men star said in a statement Monday. “She’s the best stepmom Sam, Lola and Cassandra could ever hope for. Seeing her love and affection with those three, I know she’ll be an amazing mom. Unless I bat 100 percent, perhaps a boy awaits us.”

Sheen, 42, already has three daughters: Sam, 4, and Lola, 3, with ex-wife Denise Richards, and Cassandra, 23, with ex-girlfriend Paula Profitt.

“Brooke found out for sure on Friday and is thrilled to death,” a family source says. “Brooke loves Charlie very much and has wanted a baby for some time.”