| Year | Title | Accolade | Results | Ref. |
|---|
| 2000 | Almost Famous | Award Circuit Community Award for Best Supporting Actress | Won | |
| 2000 | — | Golden Apple Award for Female Discovery of the Year | Won | |
| 2000 | Almost Famous | Kansas City Film Critics Circle Award for Best Supporting Actress | Won | |
| 2000 | Almost Famous | Las Vegas Film Critics Society Award for Best Supporting Actress | Won | |
| 2001 | Almost Famous | American Comedy Award for Funniest Supporting Actress in a Motion Picture | Nominated | |
| 2001 | Almost Famous | Blockbuster Entertainment Award for Favorite Female – Newcomer | Won | |
| 2001 | Almost Famous | Chicago Film Critics Association Award for Most Promising Actress | Nominated | |
| 2001 | Almost Famous | Chicago Film Critics Association Award for Best Supporting Actress | Nominated | |
| 2001 | Almost Famous | Dallas-Fort Worth Film Critics Association Award for Best Supporting Actress | Won | |
| 2001 | Almost Famous | Florida Film Critics Circle Award for Newcomer of the Year | Won | |
| 2001 | Almost Famous | MTV Movie + TV Award for Best Female Performance | Nominated | |
| 2001 | Almost Famous | MTV Movie + TV Award for Best Dressed | Nominated | |
| 2001 | Almost Famous | Online Film & Television Association Award for Best Breakthrough Performance – Female | Nominated | |
| 2001 | Almost Famous | Online Film & Television Association Award for Best Supporting Actress | Nominated | |
| 2001 | Almost Famous | Online Film Critics Society Award for Best Cinematic Debut/Breakthrough | Nominated | |
| 2001 | Almost Famous | Online Film Critics Society Award for Best Supporting Actress | Won | |
| 2001 | Almost Famous | Online Film Critics Society Award for Best Ensemble | Won | |
| 2001 | Almost Famous | Phoenix Film Critics Society Award for Best Newcomer | Nominated | |
| 2001 | Almost Famous | Phoenix Film Critics Society Award for Best Supporting Actress | Won | |
| 2001 | Almost Famous | Satellite Award for Best Supporting Actress in a Motion Picture – Comedy or Musical | Won | |
| 2001 | Almost Famous | Southeastern Film Critics Association Award for Best Supporting Actress | Nominated | |
| 2001 | Almost Famous | Teen Choice Award for Choice Movie Actress | Nominated | |
| 2003 | How to Lose a Guy in 10 Days | MTV Movie + TV Award for Best Female Performance | Nominated | |
| 2003 | How to Lose a Guy in 10 Days | Teen Choice Award for Choice Movie Actress – Comedy | Nominated | [9] |
| 2003 | How to Lose a Guy in 10 Days | Teen Choice Award for Choice Movie – Liar | Nominated |
| 2003 | How to Lose a Guy in 10 Days | Teen Choice Award for Choice Movie – Hissy Fit | Nominated |
| 2003 | How to Lose a Guy in 10 Days | Teen Choice Award for Choice Movie – Liplock (shared with Matthew McConaughey ) | Nominated |
| 2003 | Alex & Emma How to Lose a Guy in 10 Days | The Stinkers Bad Movie Award for Worst Actress | Nominated | |
| 2004 | — | Premiere New Power Award for Actress | Won | |
| 2004 | Raising Helen | Teen Choice Award for Choice Movie Actress – Comedy | Nominated | |
| 2007 | You, Me and Dupree | Teen Choice Award for Choice Movie Actress – Comedy | Nominated | |
| 2008 | Fool's Gold | Alliance of Women Film Journalists Award for Actress Most In Need of a New Agent | Won | |
| 2009 | Fool's Gold My Best Friend's Girl | Golden Raspberry Award for Worst Actress | Nominated | |
| 2009 | Bride Wars | MTV Movie + TV Award for Best Fight (shared with Anne Hathaway ) | Nominated | |
| 2009 | — | People's Choice Award for Favorite Leading Lady | Won | |
| 2009 | Nine | Satellite Award for Best Ensemble in a Motion Picture | Won | |
| 2009 | Bride Wars | Teen Choice Award for Choice Movie Actress – Comedy | Nominated | [10] [11] |
| 2009 | Bride Wars | Teen Choice Award for Choice Movie – Hissy Fit | Nominated | [11] |
| 2009 | Bride Wars | Teen Choice Award for Choice Movie – Rumble (shared with Anne Hathaway) | Nominated | [10] [11] |
| 2009 | Cutlass | Tribeca Film Festival Award for Best Narrative Short | Nominated | |
| 2009 | Nine | Washington DC Area Film Critics Association Award for Best Enemble | Nominated | |
| 2010 | Nine | Online Film & Television Association Award for Best Music, Original Song "Cinema Italiano" | Nominated | |
| 2012 | Something Borrowed | Alliance of Women Film Journalists Award for Actress Most In Need of a New Agent | Nominated | |
| 2012 | Almost Famous | Awards Circuit Community Award for Best Supporting Actress of the Decade | Runner-up | [12] |
| 2015 | Wish I Was Here | Jupiter Award for Best International Actress | Nominated | [13] |
| 2017 | Mother's Day | Golden Raspberry Award for Worst Supporting Actress | Nominated | [14] |
| 2021 | Music | Golden Raspberry Award for Worst Actress | Won | |