Brooke Mueller and Charlie Sheen
08/25/2008 at 12:00 PM EDT
Charlie and Brooke Sheen's summer of love, which began with their wedding in May, is closing with more exciting news: They are expecting their first child together, his rep confirms.
"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 tells PEOPLE. "Brooke loves Charlie very much and has wanted a baby for some time."
The pregnancy doesn't come as a major surprise: The pair began talking kids
right after their wedding, with Brooke joking that she wanted triplets. "Could you imagine if I really had triplets?" she told Extra
in June. "He'd be like, 'Whoa!'"
The couple were married
in front of about 60 close friends and family at a private estate in Los Angeles in May. Earlier this month, Sheen, 42, reflected on married life
with Brooke, saying it's "fabulous." He added, "We're having a ball. I'm the luckiest man in the world."
See more stars sharing their baby news