Hilary Erhard Duff (born September 28, 1987) is an American actress, singer-songwriter, entrepreneur, 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 has appeared in films, including The Lizzie McGuire Movie, Cheaper by the Dozen, A Cinderella Story and Cheaper by the Dozen 2.
In November 2008, Duff's first greatest hits album, Best of Hilary Duff, was released and the album's first single "Reach Out", which samples Depeche Mode's "Personal Jesus", was released in the previous month. The song became Duff's third number one dance hit. She then parted ways with Hollywood Records after six years of service and then announced to MTV that she would begin work on her new album in December 2008.
In February 2009, Duff and DKNY Jeans announced their new design partnership and the launch of their collaborative apparel line. Duff co-designed a collection of special pieces with DKNY Jeans brand called Femme for DKNY Jeans. The clothing line debuted in fine department and specialty stores nationwide in August 2009 and was around for a limited time.
Duff appeared in episodes of Ghost Whisperer and of Law & Order: Special Victims Unit in April 2009. In July 2009, She attained a role in Gossip Girl as a recurring guest star. She played the character of Olivia Burke, a movie star who enrols at NYU in search of a traditional college experience. The following year, she won a Teen Choice Award for "Best Female Scene Stealer" for her role as Olivia Burke.
In September 2009, Duff released a second clothing line with DKNY Jeans as Femme for DKNY in the objective of designing a clothing line for girls her own age.
Hilary Duff promoting her book Elixir in Rio de Janeiro