Alyson Hannigan

Alyson Hannigan is an American actress born in Washington, D.C. on March 24th, 1974. She is best known for playing the role of nerdy witch girl Willow Rosenberg on the 1997-2004 television series Buffy the Vampire Slayer. She appeared in 144 of the 145 aired episodes of the series.

Hannigan reprised the role of Willow for three episodes of the Buffy spin-off series Angel. She appeared in "Disharmony", "There's No Place Like Plrtz Glrb" and "Orpheus"

In 2005, she found new critical and commercial success in the sitcom How I Met Your Mother playing the role of kindergarten teacher and artist Lily Aldrin. Hannigan's character is credited in every episode of the series.