Buster Timothy Miller was born in Los Angeles on Wednesday, weighing 9 lbs. He is the first child for the couple.
Miller, 36, and Hicks, 35, married earlier this year.
Hicks played Mara Sewell on F/X’s “The Shield.” Her character was also pregnant during the show’s final season, which concluded last month.
Related Content from AccessHollywood.com:
VIEW THE PHOTOS: Star Couples
PLAY IT NOW: 2008 ABC TCAs: ‘Eli Stone’
PLAY IT NOW: Access Extended: Jonny Lee Miller Behind The Scenes Of 'Eli Stone'