Hilary Erhard Duff is an American actress, singer, songwriter, entrepreneur, author, and humanitarian. She is the younger sister of Haylie Duff.
Hilary is best known for her role as Lizzie McGuire. She played Lizzie in the Disney Channel television series with the same name and The Lizzie McGuire Movie, and is set to reprise her role in a revival series airing on Disney+. She also played Isabella Parigi.
In 2002, Hilary played Kelly Collins in the Disney Channel Original Movie Cadet Kelly.
Hilary's new album Breathe In. Breathe Out. was released on June 16, 2015. People can currently see her as Kelsey Peters in the TV series Younger.