Both 36, Garner and Affleck are also parents to daughter Violet, 3. Just few days before the big news, Garner was spotted with Violet at the Farmer's Market in Pacific Palisades and grabbing a decaf coffee at Caffe Luxxe in Santa Monica with a girlfriend.
Victor Garber, the ex-'Alias' costar and close friend, said that the actress needs no help in the mommy department. "It's her second child," Garber said. "She knows what to do. She's probably the best mother I've ever witnessed," Garber added.
Garner confirmed her second pregnancy in August.