"Country star Brad Paisley and his wife, actress Kimberly Williams-Paisley, welcomed a son in Nashville on Thursday, their rep tells PEOPLE.
The couple's first child was born at 5 a.m. and "mother and baby are resting comfortably," says publicist Michelle Bega.
Paisley, 34, and Williams-Paisley, 36, married in March 2003 in Los Angeles.
Williams stars on ABC's According to Jim and appeared in the movies Father of the Bride and How to Eat Fried Worms.
Paisley released his latest album, Time Well Wasted, last year and is now touring the United States."