Jennifer Garner and Ben Affleck are proud parents of baby #3 -- a boy born in Santa Monica, according to Us Weekly.

The couple have daughters Violet, 6 and Seraphina, 3.

Jen told Jay Leno, last month, of hubby Ben's desire to have a boy versus another girl: "I would have thought [he wanted a boy] ... And then [Ben] kind of said, 'Well, we have girls. We know how to do girls. My girls love me. I'm the big guy in the house.'"

No doubt, Ben's one happy daddy now!

UPDATE: Ben and Jen have revealed their newborn son’s name: Samuel Garner Affleck!