Alyson Hannigan originated the iconic witch Willow on "Buffy the Vampire Slayer."
Hannigan had fairly minor roles before busting out with "Buffy." She followed it up with roles in the "American Pie" movie series and another iconic TV role as Lily on "How I Met Your Mother." She's currently the host of "Penn & Teller: Fool Us."
She married recurring "Buffy" star Alexis Denisof and the couple have two daughters.