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Alyson Hannigan in How I Met Your Mother Neil Patrick Harris, Alyson Hannigan and Josh Radnor in How I Met Your Mother Alyson Hannigan, Jason Segel, Josh Radnor and Cobie Smulders in How I Met Your Mother Alyson Hannigan, Jason Segel, Josh Radnor and Cobie Smulders in How I Met Your Mother Alyson Hannigan and Jason Segel in How I Met Your Mother Mena Suvari, Jason Biggs, Alyson Hannigan, Chris Klein, Tara Reid, Seann William Scott and Eddie Kaye Thomas in American Reunion James C. Leary with Alyson Hannigan and Emma Caulfield on the set of Buffy. Alyson Hannigan, Amber Benson and Jeff Lam just hangin' out!

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View the latest pictures, photos and images of Alyson Hannigan - Alyson, born in Washington DC, began her acting career in Atlanta at the young age of 4 in commercials sponsoring such companies as McDonald's, Six Flags, and Oreos. She is a seasoned television actress veteran, guest starring in Picket Fences, Roseanne, Touched by an Angel and the The Torkelsons before starring in her most notorious role yet in Buffy the Vampire Slayer as "Willow Rosenberg"... See full bio