Jennifer Garner and Ben Affleck Welcome a Baby Boy, Joining Sisters Violet and Seraphina!

Ben Affleck is finally not the only guy in the house now that wife Jennifer Garner has given birth to a boy, who joins sisters Violet, 6, and Serapina, 3.

OK! GALLERY: SERAPHINA AFFLECK GETS SOME SWEET SMOOCHES FROM MOMMY JENNIFER GARNER

Looks like Ben will finally get to train a future Boston Red Sox player, as daddy is a big fan.

Jennifer revealed to Jay Leno back in January that she knew sex of the baby, but Ben said she couldn't reveal it. "It will be a brother or a sister... it's going to be something. I am not supposed to share it with you, Jay."

OK! GALLERY: JENNIFER GARNER RUNS ERRANDS WITH DAUGHTER SERPAHINA IN BRENTWOOD

Well, it is a secret no more!

We can't wait to find out what they named the baby! What name should they pick?