Filmography
| Year | Title | Role | Notes |
|---|---|---|---|
| 1986 | Impure Thoughts | Patty Stubbs | As Alyson Hannigan |
| 1988 | My Stepmother Is an Alien | Jessie Mills | |
| 1991 | Switched at Birth | Gina Twigg, Age 13–16 | TV movie |
| 1995 | The Stranger Beside Me | Dana | TV movie |
| 1996 | Case for Life, AA Case for Life | Iris | TV movie |
| 1996 | For My Daughter's Honor | Kelly | TV movie |
| 1998 | Dead Man on Campus | Lucy | |
| 1999 | Hayley Wagner, Star | Jenna Jakes | TV movie |
| 1999 | American Pie | Michelle Flaherty | |
| 2000 | Boys and Girls | Betty | |
| 2001 | American Pie 2 | Michelle Flaherty | |
| 2001 | Beyond the City Limits | Lexi | |
| 2003 | American Wedding | Michelle Flaherty | |
| 2004 | Americana | Andrea | TV movie |
| 2005 | In the Game | Unknown | TV series |
| 2006 | Date Movie | Julia Jones | |
| 2011 | Love, Wedding, Marriage | Courtney | Co-starred with real-life husband Alexis Denisof |
| 2012 | American Reunion | Michelle Flaherty-Levenstein |
| Year | Title | Role | Notes |
|---|---|---|---|
| 1989–1990 | Free Spirit | Jessie Harper | Main role; 14 episodes |
| 1990 | Roseanne | Jan | Episode: "Like, a New Job" |
| 1993 | Almost Home | Samantha | Episode: "The Dance" Episode: "Hot Ticket" |
| 1994 | Touched by an Angel | Cassie Peters | Episode: "Cassie's Choice" |
| 1996 | Picket Fences | Peggy Patterson | Episode: "To Forgive Is Devine" |
| 1996 | Friends for Life | Emma Daniels | Unaired TV Pilot |
| 1997–2003 | Buffy the Vampire Slayer | Willow Rosenberg | Main role; 144 episodes |
| 1999–2000 | 100 Deeds for Eddie McDowd | Gigi | Episode: "Dogs Day Out" Episode: "The Return of Gigi" |
| 2000 | Wild Thornberrys, TheThe Wild Thornberrys | Gerda | Episode: "Every Little Bit Alps" |
| 2001–2003 | Angel | Willow Rosenberg | Episode: "Disharmony" Episode: "There's No Place Like Plrtz Glrb" Episode: "Orpheus" |
| 2004 | That '70s Show | Suzy Simpson | Episode: "Sally Simpson" Episode: "Won't Get Fooled Again" |
| 2004 | King of the Hill | Stacey Gibson | Episode: "Talking Shop" |
| 2005 | Veronica Mars | Trina Echolls | Episode: "Ruskie Business" Episode: "Hot Dogs" Episode: "My Mother, the Fiend" |
| 2005–Present | How I Met Your Mother | Lily Aldrin | Main role; 153 episodes |
| 2009 | Goode Family, TheThe Goode Family | Michelle | Episode: "Graffiti in Greenville" |
| 2011 | Simpsons, TheThe Simpsons | Melody | Season 22: Episode 11: "Flaming Moe" |
| 2011 | American Dad | Chelsea | Season 7: Episode 5: "Virtual In-Stanity" |
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