Birth : March: 24, 1974, Washington, D.C., USA.
Appeared in commercials for Oreo's and McDonalds, at a young age.
Although Hannigan had appeared in an industrial film for "Active Parenting" as a baby, as well as starred in a commercial for the Duncan Hines cookie mix in 1978, it wasn't until she moved to Los Angeles, California in 1985 that she formally began her acting career.
Appeared in the movie : "My Step Mother's an Alien",
In The 1994-1995 Season, Alyson was cast as Willow Rosenberg in "Buffy".
Appeared in more movies such as : "Dead man on Campus", "Great Falls".
In early 2004, Hannigan made her West End debut, starring in a stage adaptation of When Harry Met Sally... at the Theatre Royal Haymarket, opposite Luke Perry.
In 2005, Hannigan returned to starring in a regular television series, appearing in the hit comedy, How I Met Your Mother, as Lily, and also playing a recurring guest role on Veronica Mars as Trina Echolls.
In February 2006, Hannigan starred as Julia Jones in Date Movie, a parody on romantic comedies
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