Arrival date: April 17 It's... a boy! The son to the According to Jim actress and country star is JasperWarren. And baby makes... four. The new baby joins older brother, William Huckleberry. Birth announcement: "I never had [a sibling]," Paisley had told PEOPLE last year. "I think [Huck] will be a great big brother. He'll learn to share, which is something I never did!"