Hilary Erhard Duff (born September 28, 1987) is an American actress and pop music singer. After gaining prominence in the television show ''Lizzie McGuire'', she has since gone onto a film career, with roles in mainstream pictures such as ''Cheaper by the Dozen'' and independent films such as ''Material Girls'' and ''The Perfect Man''. Duff has also launched a successful music career that has yielded two number one albums in the U.S.
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