Jesse McCartney

Jesse McCartney (born April 9, 1987) is an American singer-songwriter, actor, and voice actor. McCartney achieved fame in the late 1990s on the daytime drama All My Children as JR Chandler. He later joined boy band Dream Street, and eventually branched out into a solo musical career. Additionally, McCartney has appeared on shows such as Summerland and Greek. McCartney also is known for lending his voice as Theodore in Alvin and the Chipmunks and its sequels, as well as voicing Robin/Nightwing in Young Justice and Roxas and Ventus in the video games series Kingdom Hearts developed by Square Enix.

source: Wikipedia