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 , Willow Rosenberg in the television series Buffy the Vampire Slayer and Michelle Flaherty in the American Pie film series .

Hannigan was born in Washington, D.C., the only child of Emilie Haas, a real estate agent, and Al Hannigan, a truck driver. Her father is of Irish ancestry and her mother is Jewish. Her parents divorced when she was two and she was raised mostly by her mother in Atlanta, Georgia.

Source: Wikipedia