LOS ANGELES (CBS) — It’s a boy for Jennifer Garner and Ben Affleck! The celebrity couple welcomed their third child in Santa Monica, a source told People.

Affleck, 39, announced the name of his family’s new addition on Facebook.

“We are happy to announce on February 27, Jennifer gave birth to a healthy baby boy, Samuel Garner Affleck,” the actor posts.

The couple announced they were expecting in August. Garner told Jay Leno in January that they knew the sex of the baby, but were not going to share it, according to People.

Though, in September Garner discussed with Ellen DeGeneres, on her show, the possibility of having a boy.

“It would be so weird to have a boy,” Garner told DeGeneres, but she also said it would be “cool and different,” according to People.

Samuel’s siblings are 6-year-old Violet Anne and 3-year-old Seraphina Rose.

Garner and Affleck met on the set of 2003′s “Daredevil” and were married in 2005.