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Alyson Hannigan poster

Alyson Hannigan

Alyson Lee Hannigan (born March 24, 1974) is an American actress. She currently plays Lily Aldrin in the CBS sitcom How I Met Your Mother, but is best known for her previous role as Willow Rosenberg on the television series Buffy the Vampire Slayer. She also played flautist Michelle Flaherty in the American Pie film series.
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