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Alison "Ali" Ann Sweeney (September 19, 1976) is an American actress, reality show host, director and author known for playing Samantha "Sami" Brady in Days of Our Lives from 1993 to 2014. In 2007 she became the host of The Biggest Loser.

She played School Girl #1 in You Ruined My Life and Christy McCray in Brand New Life.