Hilary Erhard Duff (born September 28, 1987) is an American actress and singer-songwriter. Duff began her acting career at a young age, and quickly became labeled a teen idol as the title character of the Disney Channel teen comedy series Lizzie McGuire (2001–2004). The series proved to be a hit, leading to a film adaptation of the series to be released. Duff began working on numerous projects with the Disney Channel, including the film Cadet Kelly (2002). Duff began to expand her career into theatrical films, with leading roles in projects such as Agent Cody Banks (2003), Cheaper by the Dozen (2003), A Cinderella Story (2004), and Cheaper by the Dozen 2 (2005). After experiencing commercial and critical failure in Material Girls (2006), she began appearing in independent films such as War, Inc. (2008), According to Greta (2009), and Bloodworth (2010). She also had guest roles in television series such as Ghost Whisperer, Two and a Half Men and a recurring role on Gossip Girl. Beginning 2015, she currently stars in the TV Land comedy-drama series Younger as Kelsey Peters alongside Sutton Foster and Debi Mazar, which earned her a People's Choice Awards nomination for two years straight in 2016 and 2017.
In February 2015, Duff filed for divorce from Comrie, citing irreconcilable differences,  and requesting primary physical and legal joint custody of their son.  The divorce was finalized in February 2016. 
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Duff told the Chicago Sun-Times in 2005 that because she was under the control of a record label during the making of Metamorphosis and Hilary Duff , she wasn't able to incorporate the sound she wanted into her recordings. She said the production "[had] been mastered and sounds really pretty ... If I could change it, I would, and it would sound [less pop]. My name is Hilary Duff, and I don't know why I don't get to make Hilary Duff music."