Alyson Lee Hannigan (born March 24, 1974) is an American actress. She is known for her roles as Willow Rosenberg on the cult classic television series Buffy the Vampire Slayer, Michelle Flaherty in three American Pie films and Lily Aldrin on the CBS sitcom How I Met Your Mother. Alexis Denisof (born February 25, 1966) is an American actor who is known for playing Wesley Wyndam-Pryce in the television series Buffy the Vampire Slayer and its spin-off Angel.
