Alyson Hannigan

Alyson Lee Hannigan-Denisof (born March 24, 1974) is an American actress. She is best known for her roles as Lily Aldrin on the CBS sitcom How I Met Your Mother, Willow Rosenberg on the television series Buffy the Vampire Slayer, and Michelle Flaherty in three American Pie films.



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. In 1997, Hannigan was cast to play Willow Rosenberg, Buffy's best friend, on the television series Buffy the Vampire Slayer. The show became a success, and Hannigan gained recognition, subsequently appearing in several notable films aimed at teenage audiences, including American Pie, American Pie 2, Boys and Girls, and American