Sterling Sandmann Knight (born March 5, 1989) is an American actor, singer-songwriter and musician. He is best known for his roles in the 2009 film 17 Again as Alex, in Sonny With a Chance and So Random! as Chad Dylan Cooper, and in the Disney Channel Original Movie Starstruck as Christopher Wilde.
Knight began his career on stage in local productions. He made his acting debut in minor roles in Calm, Career Day, and Hi-Jinks. Knight's first role with Disney was in an episode of Hannah Montana, playing Lily's boyfriend Lucas, in 2007. Later in the year, Knight also appeared in two episodes of The Closer. In 2008, Knight appeared in Out of Jimmy's Head and Grey's Anatomy. In 2009, Knight started the role of Chad Dylan Cooper on Sonny With a Chance opposite of Demi Lovato. He made his film debut in 17 Again playing Alex, Matthew Perry/Zac Efron's son.
- Although Sterling was credited for voicing Buttermaker in "McFreaks", Buttermaker never speaks in the episode.