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Alyson Hannigan BiographyAlyson Hannigan (born Allison Lee Hannigan March 24, 1974) is an American actress best known for playing Willow Rosenberg in the TV series Buffy the Vampire Slayer. She also appeared in films including, as Michelle Flaherty, American Pie (1999), American Pie 2 (2001) and American Wedding (2003).Born in Washington, DC to an Irish-American father and a Jewish-American