When Jennifer, 39, announced her pregnancy back in August, she said she was thrilled to have another girl, while Ben was elated no matter the gender.
Few details have been released about Garner's labor, but a close source confirmed the happy news to US Weekly.
Jennifer was last spotted out with her daughters Violet, six and Serafina, three, just last week as she took them to a library.
While her daughters made a list of names that included Donald Duck and Minnie Mouse Affleck, we wonder what the Hollywood couple ultimately landed on for their new lad.
As Violet and Serafina learn to play big sisters and Ben starts sharing his 'man of the house' role, Jennifer will prep for her role in The Odd Life of Timothy Green, in which she plays one half of a 'childless couple who bury a box in their backyard, containing all of their wishes for an infant.'
Are Garner and Affleck ready for their newest addition? And are the girls ready to share all the attention they've garnered thus far?
Only time will tell! We wish the joyous family all the best.