Alyson Hannigan

Alyson Lee Hannigan is an American actress. She is best known for her roles as Lily Aldrin on the CBS sitcom How I Met Your Mother (2005–2014), Willow Rosenberg in the television series Buffy the Vampire Slayer (1997–2003) and Michelle Flaherty in the American Pie film series (1999–2012). She is the current host of Penn & Teller: Fool Us.