Alyson Hannigan, born on March 24, 1974 is an American actress.  Alyson Hannigan plays Lily Aldrin in the CBS sitcom How I Met Your Mother. She is also known for her earlier roles as Willow Rosenberg over the television series “Buffy the Vampire Slayer” and flautist “Michelle Flaherty” in the American Pie film series. She is a sexy actress of Hollywood film industry.