Hilary Erhard Duff (born September 28, 1987) is an American actress, singer-songwriter, entrepeneur, and book author. After working in local theater plays and television commercials in her childhood, Duff gained fame playing the title role in the Disney Channel television series Lizzie McGuire. She subsequently ventured into motion pictures and has appeared in many successful films, including The Lizzie McGuire Movie, Cheaper by the Dozen, A Cinderella Story and Cheaper by the Dozen 2. She most recently appeared in According to Greta, Stay Cool, and Bloodworth. Her upcoming films include The Story of Bonnie and Clyde, and She Wants Me.
Duff has expanded her repertoire to include pop music and has released three RIAA-certified platinum albums. Metamorphosis, her debut studio album, was certified triple platinum. Her next two albums, Hilary Duff and Most Wanted, were also certified platinum. In 2007, Duff released her third studio album, Dignity, which was certified gold and spawned her highest charting US single to date, "With Love". Best of Hilary Duff, a compilation of her greatest hits, was released in the last quarter of 2008. Duff has sold over thirteen million records worldwide. Billboard ranked her the 69th best selling artist of the 2000s.
Branching into the fashion industry, Duff has also launched her own clothing lines, Stuff by Hilary Duff and Femme for DKNY Jeans, and has signed with IMG Models. She has also released two exclusive perfume collections with Elizabeth Arden. Her other business ventures include writing a young adult novel, Elixir, and working as an executive producer for According to Greta and as a producer for the films Material Girls and Beauty & the Briefcase.
In 2007, Duff began dating Canadian NHL Pittsburgh Penguins player Mike Comrie. On February 19, 2010, Duff and Comrie announced their engagement. The couple married on August 14, 2010 in Santa Barbara, California.