Ben Affleck posts on Facebook:  "We are happy to announce on February 27, Jennifer gave birth to a healthy baby boy, Samuel Garner Affleck."

Wife Jennifer Garner stays mum on her Facebook page.

The celebrity power-couple has two other children together, Violet, 6, and Seraphina, 3. Baby Samuel G. Affleck joins the family and is their first son together.
Jennifer Garner married Ben Affleck in 2005.