Hannigan was born in Washington, DC, the only child of Emilie (Posner) Haas, a real estate agent, and Al Hannigan, a truck driver.
Her father is of Irish ancestry and her mother is Jewish Her parents divorced when she was two, and she was raised mostly by her mother in Atlanta, Georgia.
Alyson Hannigan has been in a relationship with Ginger Fish(1990-1998). she is best known for her roles as Willow Rosenberg on the television series Buffy the Vampire Slayer, Michelle in American Pie and Lily Aldrin on How I Met Your Mother.
While most of these TV couples arise from being part of a fictional relationship, romance has often blossomed between cast members who never actually had any romantic connection on screen.Offerman and Mullally play crazy exes Ron and Tammy on "Parks and Recreation," where Ron often describes Tammy as a "serious b**ch" whom he hates with a passion.But in real life, the couple has been married since September 2003.Catching up with your favorite TV characters is one of life's greatest pleasures, but did you know that some of the faces you love on the small screen are actually hitched offscreen?Below are 9 television co-stars -- some who play lovers and some who don't -- who got married in real life.Poor rat-smashing, spaghetti-bag-eating Charlie Kelly (played by Charlie Day) on "Always Sunny In Philadelphia" is in love with The Waitress (Mary Elizabeth Ellis), who hates him and has sex with everyone he knows instead.