After keeping her Twitter fans guessing for most of the day, Alyssa Milano revealed her big news – the baby she's expecting early this fall is a little boy.

"As fun as it was reading all of your gender predictions on Twitter, I’m really bad at keeping secrets and had to share (not to mention, I was bound to unintentionally slip at some point)," the expectant actress, 38, wrote on her Web site Monday evening.

"David and I are elated to announce that we are having a baby boy. We can’t wait to meet him. Boys names, anyone?"

Milano and husband David Bugliari wed in August 2009 and announced in February that they were expanding their family.