Hilary Erhard Duff (born September 28, 1987) is an American actress, singer-songwriter, entrepreneur, and author. After working in local theater plays and television commercials in her childhood, she achieved fame playing the title role in the Disney Channel television series Lizzie McGuire. She also reprised her role in the The Lizzie McGuire Movie. With the success of the Lizzie McGuire franchise, she established herself as a teen idol. Hilary Duff subsequently ventured into motion pictures and has appeared in many successful films, including Agent Cody Banks, Cheaper by the Dozen, A Cinderella Story and Cheaper by the Dozen 2.