Sterling Knight (born March 5, 1989) is an American actor and singer. Knight began his career on stage in local productions. Knight has played the role of Chad Dylan Cooper in the Disney Channel Original Series, Sonny With a Chance and is currently reprising this role in "So Random!", another Disney series. He also appeared in the Disney Channel Original Movie, Starstruck. Knight played guest roles on Hannah Montana and Grey's Anatomy. He starred in the film 17 Again as Mike O'Donnell's son.