Hilary Erhard Duff is an American actress, singer, songwriter and author. Duff began her acting career at a young age and quickly became labeled a teen idol as the title character of the Disney Channel television series Lizzie McGuire and in the theatrical film based off the series, The Lizzie McGuire Movie. Thereafter, Duff appeared in numerous films, with leading roles in Agent Cody Banks, Cheaper by the Dozen, A Cinderella Story, and Cheaper by the Dozen 2. After experiencing commercial and critical failure in Material Girls, Duff began appearing in independent films such as War, Inc.