Alyson Hannigan (born March 24, 1974) is an American actress who plays Lily Aldrin in the CBS sitcom How I Met Your Mother. She is also known for her previous roles as Willow Rosenberg on the television series Buffy the Vampire Slayer and flautist Michelle Flaherty in the American Pie film series. Career
Hannigan's first major film role was in My Stepmother Is an Alien, a science fiction comedy released in 1988; one of her co-stars in the film was actor Seth Green, who would later join her in the regular cast of Buffy as her on-screen boyfriend.

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