Hilary Erhard Duff (born September 28, 1987) is an American actress, singer, songwriter, entrepreneur, author, and humanitarian. Born and raised in Houston, Texas, Duff appeared in local theatre productions and television commercials before coming to prominence in the title role of Disney Channel's teen comedy Lizzie McGuire. Established as a teen idol, Duff reprised that role in The Lizzie McGuire Movie (2003) and ventured into motion pictures with her early films Agent Cody Banks (2003), Cheaper by the Dozen (2003), A Cinderella Story (2004) and Cheaper by the Dozen 2 (2005) being among the biggest commercial successes of her career. Most recently, she has performed in a string of independent films and television dramas like Gossip Girl in addition to sharing production credits.
After signing with Hollywood Records, Duff expanded her repertoire to include pop music and has released several albums. Her debut studio album Metamorphosis (2003) was RIAA-certified triple platinum while the subsequent studio album Hilary Duff (2004) and compilation album Most Wanted (2005) were both certified platinum. She exhibited a more adult image with the release of Dignity (2007), which displayed a shift to more of a dance-oriented sound. Certified gold, the album spawned her highest charting US single to date "With Love" which also peaked at number 1 on Billboard's Hot Dance Club Songs chart, becoming the first of her three consecutive number ones on that chart. Prior to the release of Best of Hilary Duff (2008), a compilation of her greatest hits, Duff had sold thirteen million albums worldwide and had performed across the world on four concert tours.
Branching into various other industries, Duff has turned her hand to fashion with the launch of her own clothing lines Stuff by Hilary Duff and Femme for DKNY Jeans in addition to being signed with IMG Models and releasing two exclusive perfume collections with Elizabeth Arden. In addition to writing a series of young adult novels, comprising Elixir (2010) and Devoted (2011), she has also contributed to several humanitarian causes. Duff has attracted a great deal of publicity, particularly surrounding her personal life. She is married to former hockey player Mike Comrie, with whom she has one child.
On January 15, 2014, it was announced that Duff signed on to co-star opposite Sutton Foster in a pilot episode for the sitcom Younger, based on a Pamela Redmond Satran novel. Duff is currently working on a new album with Ed Sheeran.