NEW YORK -- Ben Affleck is using Facebook to announce the birth of his son with wife, former Charleston resident Jennifer Garner.

The actor posted on his timeline that he and Garner are "happy'' about the arrival of Samuel Garner Affleck, born Feb. 27. He describes the baby as "healthy.''

This is the couple's third child and first son. Samuel joins sisters Violet, 6, and Seraphina, 3.

Affleck and Garner, a graduate of George Washington High School, were married in 2005. They met on the set of the movie "Daredevil,'' based on a comic book series.