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Alyson Lee Hannigan (born March 24, 1974) is an American actress. She currently plays Lily Aldrin in the CBS sitcom How I Met Your Mother, but is best known for her previous role as Willow Rosenberg on the television series Buffy the Vampire Slayer. She also played flautist Michelle Flaherty in the American Pie film series.
She married actor Alexis Denisof (who played Wesley Wyndam-Pryce in the Buffy/Angel franchise) at Two Bunch Palms Resort in Desert Hot Springs, California on October 11, 2003. They bought a house together in Santa Monica, California. Wiki