Jennifer and husband Ben Affleck's new addition was born in Santa Monica, California, joining big sisters Violet, 6, and Serafina, 3, according to Us Weekly and PEOPLE.
For months it had been speculated that Jennifer and Ben would welcome a baby boy to their growing family, yet the couple would neither confirm nor deny the sex of the baby.
Jennifer Garner Would Do 'Anything' for Ben
Jen, 39, and Ben, 39, announced the happy news in August of 2011, telling the Associated Press they were "thrilled" to announce their third bundle of joy was indeed on the way.
