Filmography
| Year | Film | Role | Other notes |
|---|---|---|---|
| 1999 - 2000 | Get Real | Meghan Green | TV series, 1999-2000 |
| 2001 | The Princess Diaries | Amelia "Mia" Thermopolis | |
| The Other Side of Heaven | Jean Sabin | ||
| 2002 | The Cat Returns | Haru | Voice |
| Nicholas Nickleby | Madeline Bray | ||
| 2004 | Ella Enchanted | Ella of Frell | |
| The Princess Diaries 2: Royal Engagement | Amelia "Mia" Thermopolis | ||
| 2005 | Hoodwinked! | Red Puckett | voice |
| Havoc | Allison Lang | Direct-to-video (U.S.) | |
| Brokeback Mountain | Lureen Newsome Twist | Nominated - Screen Actors Guild Award for Outstanding Performance by a Cast in a Motion Picture | |
| 2006 | The Devil Wears Prada | Andrea "Andy" Sachs | |
| 2007 | Becoming Jane | Jane Austen | |
| 2008 | Get Smart | Agent 99 | |
| Passengers | Claire Summers | ||
| Rachel Getting Married | Kym | ||
| 2009 | Bride Wars | Emma | in post-production |
| 2010 | Alice in Wonderland | White Queen | filming |
| The Fiance | unknown | pre-production |