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 ...

Sarah Michelle Gellar and Alyson Hannigan chatted with ET on set of the 'Buffy the Vampire Slayer' episode, 'The Prom,’ in 1999. The 'How I Met Your Mother' star is proud of her success.

Alyson Hannigan is married to Alexis Denisof. Like Hannigan, Denisof is also an actor. His most notable projects include Buffy the Vampire Slayer and How I Met Your Mother, shows Hannigan also ...

Alyson Hannigan revealed that she lost 20 pounds while competing on Dancing With the Stars, posting side-by-side photos her transformation while discussing her insecurities. Twenty years after Kim ...