King made her film debut in Reign Over Me, as Adam Sandler's character's daughter, and then voiced the yellow fur ball Katie in the animated feature Horton Hears a Who! (2008), and Beaver, for Ice Age: Dawn of the Dinosaurs (2009). She also appeared in Quarantine (2008). In 2010, she guest starred in the series Ghost Whisperer. She was also featured in The Suite Life of Zack & Cody as Emily Mason in two episodes. Other television appearances include Entourage, CSI: Crime Scene Investigation, and Medium.