Alyson Lee Hannigan-Denisof is an American actress. She is best known for her role as Willow Rosenberg on the television series Buffy the Vampire Slayer. She currently plays Lily Aldrin on the CBS sitcom How I Met Your Mother. She also played flautist Michelle Flaherty-Levenstein in three American Pie films.
Alyson Hannigan
Alyson Lee Hannigan-Denisof is an American actress. She is best known for her role as Willow Rosenberg on the television series Buffy the Vampire Slayer. She currently plays Lily Aldrin on the CBS sitcom How I Met Your Mother. She also played flautist Michelle Flaherty-Levenstein in three American Pie films.