How I Met Your Mother

Season Premiere Monday, Sept. 21 8:00 ET/PT

Alyson Hannigan as Lily

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Biography

Alyson Hannigan is best known to television audiences as Willow in the series "Buffy the Vampire Slayer," for which she won a Teen Choice Award and a Saturn Award. Her other television credits include "Touched by an Angel" and "Picket Fences," on CBS, "Veronica Mars," "King of the Hill," "That '70s Show," "Angel: The Series" and "Roseanne."

Her feature film credits include "American Pie," "American Pie 2," for which she won a Teen Choice Award, "American Wedding," "Beyond the City Limits," "Dead Man on Campus" and "My Stepmother Is an Alien."

Hannigan was born in Washington, D.C., and raised in Atlanta. She lives in Los Angeles. Her birth date is March 24.

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Season 4: Episode 24

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