Year | Award | Category/Recipient(s) | Result |
2004 | Teen Choice | For Mean Girls:
- Choice Breakout Female Movie Star
- Choice Movie Actress - Comedy
- Choice Movie Blush
- Choice Movie Hissy Fit
- Choice Movie Sleazebag
| Nominated |
2005 | Teen Choice | The Notebook:
- Choice Movie Actress - Drama
- Choice Movie Chemistry
- Choice Movie Liplock
- Choice Movie Love Scene
| Won |
2005 | Teen Choice | Choice Movie Dance Scene for The Notebook | Nominated |
2006 | Teen Choice | Choice Actress - Comedy (Wedding Crashers) | Won |
2006 | Teen Choice | Choice Liplock (Wedding Crashers) | Nominated |
| 2005 | Satellite | Outstanding Actress in a Supporting Role, Comedy or Musical (The Family Stone) | Nominated |
| 2005 | MTV Movie Award | Best Kiss (The Notebook) Best On-Screen Team (Mean Girls) Breakthrough Female (Mean Girls) | Won |
| 2005 | MTV Movie Award | Best Female Performance (The Notebook) Best Villain (Mean Girls) | Nominated |
| 2006 | MTV Movie Award | Best Performance (Red Eye) | Nominated |
| 2005 | Hollywood Film Festival | Breakthrough Actress | Won |
| 2004 | Gemini | Best Performance by an Actress in a Featured Supporting Role in a Dramatic Series (Slings and Arrows) | Won |
| 2006 | Gemini | Best Performance by an Actress in a Guest Role in a Dramatic Series (Slings and Arrows) | Nominated |
| 2006 | BAFTA | Rising Star Award | Nominated |
| 2006 | Saturn | Best Actress (Red Eye) | Nominated |
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