Alyson Lee Hannigan (born March 24, 1974) is an American actress. She is best known for her roles as Michelle Flaherty in three American Pie films, Lily Aldrin on the CBS sitcom How I Met Your Mother and Willow Rosenberg on the television series Buffy the Vampire Slayer.Alyson Hannigan,Alyson Hannigan photos,Alyson Hannigan wallpapers,Alyson Hannigan free desktop wallpaper,Alyson Hannigan bikini photos,Alyson Hannigan awards,Alyson Hannigan hot celebrity,Alyson Hannigan hot celebrity,Alyson Hannigan biography,Alyson Hannigan sexy,Alyson Hannigan new movies,Alyson Hannigan hot movies,Alyson Hannigan films,Alyson Hannigan new films, Alyson Hannigan photoshoot,Alyson Hannigan magazine cover,Alyson Hannigan hot celebrity mom,Alyson Hannigan with her baby,Alyson Hannigan pregnant,Alyson Hannigan fashion pregnant dress.