- Water for Elephants (2011) Marlena
- This Means War (2011)
- Untitled James L. Brooks Project (2010) Lisa
- Monsters vs Aliens (2009) (voice) Susan Murphy / Ginormica
- Four Christmases (2008) Kate
- Rendition (2007) Isabella Fields El-Ibrahimi
- Penelope (2006) Annie
- Just Like Heaven (2005) Elizabeth
- Walk the Line (2005) June Carter
- Vanity Fair (2004) Becky Sharp
- Legally Blonde 2: Red, White & Blonde (2003) Elle Woods
- Sweet Home Alabama (2002) Melanie Smooter
- The Importance of Being Earnest (2002) Cecily Cardew
- Legally Blonde (2001) Elle Woods
- The Trumpet of the Swan (2001) (voice) Serena
- Little Nicky (2000) Holly
- American Psycho (2000) Evelyn Williams
- Best Laid Plans (1999) Lissa
- Election (1999) Tracy Flick
- Cruel Intentions (1999) Annette Hargrove
- Pleasantville (1998) Jennifer
- Overnight Delivery (1998) Ivy Miller
- Twilight (1998) Mel Ames
- Fear (1996) Nicole Walker
- Freeway (1996) Vanessa Lutz
- S.F.W. (1994) Wendy Pfister
- Jack the Bear (1993) Karen Morris
- A Far Off Place (1993) Nonnie Parker
- Desperate Choices: To Save My Child (1992) (TV) Cassie Robbins
- Wildflower (1991) (TV) Ellie Perkins
- The Man in the Moon (1991) Dani Trant