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).

Duff has expanded her repertoire into pop music, with three RIAA certified-platinum albums and over thirteen million albums sold worldwide. Her first studio album, Metamorphosis (2003), was certified triple platinum and she followed it up with two more platinum albums, Hilary Duff (2004) and Most Wanted (2005). Duff's latest studio album, Dignity, was released in April 2007 and was certified Gold in August 2007.

She has also launched a clothing line, Stuff by Hilary Duff, and an exclusive perfume with Elizabeth Arden. Duff and her mother were listed as producers for the movie Material Girls, As of December 2007, her upcoming films include the action thriller War, Inc., animated comedy Foodfight! and independent films Greta and Safety Glass.

Hilary Duff (born September 28, 1987) is an American actress and singer. After gaining fame for her starring role on the television show Lizzie McGuire, she went on to have a film career, and her most commercially successful pictures include Cheaper by the Dozen (2003), The Lizzie McGuire Movie (2003), and A Cinderella Story (2004). Duff has expanded her repertoire into pop music, with three RIAA certified-platinum albums, and she launched a clothing line and an exclusive perfume with Elizabeth