Cast & creator
Alyson Hannigan
Best known for Watch What Happens Live with Andy Cohen, The Simpsons, The Daily Show
Alyson Lee Hannigan (born March 24, 1974) is an American actress and television presenter. She is best known for her roles as Willow Rosenberg in the television series Buffy the Vampire Slayer (1997–2003), as Lily Aldrin in the sitcom How I Met Your Mother (2005–2014) for which she won a People's Choice Award in 2009, and as Michelle Flaherty in the American Pie film series (1999–2012). Since 2016, Hannigan has hosted the television show Penn & Teller: Fool Us. She also provides the voice of Claire Clancy in the Disney Junior animated series Fancy Nancy (2018–present).
Also known as: Элисон Хэннигэн, Άλισον Χάνιγκαν, Άλισον Λι Χάνιγκαν, 艾丽森·汉尼根, Елісон Генніґен
30
film credits
59
television credits
87
1981–2026 · acting roles
6.4
average across scored titles
Signature credits
Known for
Across film & television
Filmography (89)
Showing 89 of 89 credits
Watch What Happens Live with Andy Cohen
Self - Guest
2009
The Simpsons
Melody Juniper (voice)
1989
The Daily Show
Self - Guest
1996
The Kelly Clarkson Show
Self
2019
Late Show with David Letterman
Self - Guest
1993Late Show with David Letterman
Self - Top Ten Presenter
1993
American Dad!
Lexie (voice)
2005American Dad!
Ugly Stepsister #2 (voice)
2005American Dad!
Chelsea (voice)
2005
Jimmy Kimmel Live!
Self - Guest
2003
King of the Hill
Stacey Gibson (voice)
1997
How I Met Your Mother
Lily Aldrin
2005
Dancing with the Stars
Self - Contestant
2005Dancing with the Stars
Self - Audience Member
2005Dancing with the Stars
Self - Rehearsal Visitor
2005
Late Night with Conan O'Brien
Self - Guest
1993
Buffy the Vampire Slayer
Willow Rosenberg
1997
The Tonight Show with Jay Leno
1992
The Ellen DeGeneres Show
Self
2003
Rugrats
Cynthia P.I. (voice)
1991
Robot Chicken
Steelheart (voice)
2005
Touched by an Angel
Cassie Peters
1994
That '70s Show
Suzy Simpson
1998
Angel
Willow Rosenberg
1999
Veronica Mars
Trina Echolls
2004
Sofia the First
(voice)
2013
The Wild Thornberrys
Gerda (voice)
1998
The Late Late Show with Craig Kilborn
Self - Guest
1999
Beat Bobby Flay
Self
2013The Reichen Show
Self
2005
The Bonnie Hunt Show
Self
2008
MTV Movie & TV Awards
Self - Presenter
1992
The Megan Mullally Show
Self - Guest
2006
The $100,000 Pyramid
Self
2016
Picket Fences
Peggy Patterson
1992
TFI Friday
1996
American Pie
Michelle Flaherty
1999
Doogie Kamealoha, M.D.
Dawn
2021
Fancy Nancy
Claire Clancy (voice)
2018
Penn & Teller: Fool Us
Self - Host
2011Penn & Teller: Fool Us
Producer
2011
Hollywood Game Night
Self
2013
Entertainment Tonight
Self
1981
American Reunion
Michelle Levenstein
2012
American Pie 2
Michelle Flaherty
2001
American Wedding
Michelle Flaherty
2003
The Torkelsons
Samantha
1991
The Gong Show
Self - Judge
2017
Roseanne
1988
Solo Mio
Meghan
2026
The Goode Family
2009
My Stepmother Is an Alien
Jessie Mills
1988
100 Deeds for Eddie McDowd
1999
I Love the '70s: Volume 2
Self
2006
Outmatched
Beth
2020
Date Movie
Julia Jones
2006
Boys and Girls
Betty
2000Pepsi Smash
Self - Host
2003
Kim Possible
Dr. Ann Possible
2019
Flora & Ulysses
Phyllis
2021
Free Spirit
Jessie Harper
1989
Dead Man on Campus
Lucy
1998
Dancing with the Stars Official Podcast
Self
2025
Outrageous Pumpkins
Self - Host
2020
Fancy Nancy: Fancy It Yourself
Nancy
2019
Star Plates
2016
Love, Wedding, Marriage
Courtney
2011
Office Race
Pat
2023
Buffy the Animated Series
Willow Rosenberg
2008
Abducted: The Mary Stauffer Story
Mary Stauffer
2019Playboy Mansion Parties Uncensored
Self
2001
You Might Be the Killer
Chuck
2019
Beyond the City Limits
Lexi
2001
For My Daughter's Honor
Kelly
1996
The Stranger Beside Me
Dana
1995
Adorableness
Self
2021
American Pie: Revealed
Self
2004American Pie: Revealed
Thanks
2004
Do You Take This Man
Rachael
2017A Case for Life
Iris
1996
Farce of the Penguins
Hottie Penguin (voice)
2006
More Business of Being Born
Self [Part 2,3]
2011
Girl Scout Cookie Championship
Self - Host
2020Man of the House
Jessie
2018
Hayley Wagner, Star
Jenna Jakes
1999
Impure Thoughts
Patty Stubbs
1986
American Pie: Beneath the Crust Vol. 2
Self
Dodie & Cheryl Get Hitched
Cheryl Crum
Teen Choice Awards
Self
1999