Alyson Hannigan is an American actress, born on March 24, 1974, in Washington, D.C. She is well known for her roles in popular television shows such as “Buffy the Vampire Slayer” and “How I Met Your Mother”. Hannigan began her acting career as a child, appearing in commercials and in small roles on television. She gained wider recognition for her role as Willow Rosenberg in “Buffy the Vampire Slayer” and went on to play Lily Aldrin in “How I Met Your Mother”. In addition to acting, Hannigan is also a talented singer and has performed in various musical productions. She is married to actor Alexis Denisof and they have two daughters together.