Original: 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.
Simplified: She started getting noticed with her roles in Buffy the Vampire Slayer as Willow Rosenberg and in the American Pie movies as Michelle Flaherty.