Dortmund, Germany - December 9th 2017: US Actress Alyson Hannigan (* 1974, Buffy The Vampire Slayer, Angel, How I Met Your Mother, American Pie) at Ge Stock Photo - Alamy
How I Met Your Mother's Buffy Reunion: Seth Green to Guest Star Alongside Alyson Hannigan - IGN
Buffy's Willow & Oz Reunite On How I Met Your Mother | The Mary Sue
How Alyson Hannigan Ended Up On How I Met Your Mother
ALYSON HANNIGAN - Best Known for Her Roles as WILLOW ROSENBERG on TV Series "BUFFY the VAMPIRE
Every Buffy The Vampire Slayer Actor In How I Met Your Mother
'How I Met Your Mother': 'Buffy's' Danny Strong, Alexis Denisof to guest
The gorgeous Alyson Hannigan from My Step Mother is an Alien, Buffy, American Pie and How i met your Mother | Alyson hannigan, Actresses, Women humor