Alyson Hannigan
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Alyson Lee Hannigan (born March 24, 1974) is an American actress and television presenter. She is best known for her roles as Willow Rosenberg in the television series Buffy the Vampire Slayer (1997–2003), Lily Aldrin in the sitcom How I Met Your Mother (2005–2014) for which she won a People's Choice Award in 2009, and Michelle Flaherty in the American Pie film series (1999–2012). Since 2016, Hannigan has presented the television show Penn & Teller: Fool Us.

Hannigan was born in Washington, D.C., the only child of Emilie (Posner) Haas, a real estate agent, and Alan Hannigan, a Teamsters trucker. Her father is of Irish ancestry and her mother is Jewish.

At age four, Hannigan began appearing in commercials. She moved to Hollywood at age 11.

Living with her mother and attending North Hollywood High School, she successfully auditioned for agents while visiting her father in Santa Barbara. After high school, she attended California State University, Northridge, where she was a member of the Alpha Chi Omega sorority and earned a degree in psychology.