Hilary Erhard Duff (born September 28, 1987) Is An American Actress, Pop Singer-songwriter And Entrepreneur. After Gaining Fame For Playing The Title Role In The Television Show Lizzie McGuire, Duff Went On To Have A Film Career; Her Most Commercially Successful Movies Include Cheaper By The Dozen (2003), The Lizzie McGuire Movie (2003), And A Cinderella Story (2004).