Domain Reserved for Alyson Hannigan Alyson Hannigan has grown up in the limelight. We watched her in My Stepmother is An Alien accross from Dan Aykroyd, Kim Basinger and Jon Lovitz back in 1988 and more currently in How I Met Your Mother airing weekly on CBS. We all remember her as the lovable Willow Rosenberg for years on Buffy The vampire Slayer and in popular movies like American Pie 1, 2, 3  and 4. Alyson has worked with the best in the business as a child star and even played a child star in the movie Hayley Wagner Child Star. In time she has become one of those A List celebrities though hard work and countless television and movie appearances. This website outlines some of Alyson's roles as well as personal appearances so fans can keep up to date and watch her in upcoming movies and TV shows.