It's a Boy for Actor Chris O'Donnell
The couple have not released a name. "Everybody is happy and healthy," says rep Leslie Sloane Zelnick.
The baby joins siblings Lily, 6, Chip, 5, and Charlie, 2. O'Donnell, 35, and Fentress, 33, married in 1997.
O'Donnell is best known for playing Robin in 1995's Batman Forever. He also starred opposite Oscar winner Al Pacino in 1992's Scent of a Woman.