Hilary Duff is an American actress, pop singer-songwriter, and author, who rose to fame for her starring role as Lizzie McGuire on the Disney television sitcom, Lizzie McGuire. She also starred in its same-titled theatrical release, and appeared in films such as Cheaprer by the Dozen, A Cinderella Story and Agent Cody Banks. Duff also has a frequent career as a singer, primarily in the pop, dance-pop and pop rock genres. To-date, Duff has sold over 13 million albums worldwide.