by Awards
| Year | Award | Category | Result |
| 1994 | Young Artist Awards | Best Performance by a Youth Actress Starring in a Motion Picture | Nominated |
| 2000 | Saturn Awards | Best Supporting Actress on Television | Nominated |
| 2001 | Teen Choice Awards | TV – Choice Actress | Nominated |
| 2003 | CAMIE Awards | Made for TV Film | Won |
| 2005 | CAMIE Awards | Made for TV Film | Won |
| 2005 | Screen Actors Guild Awards | Outstanding Performance by an Ensemble in a Drama Series | Nominated |
| 2006 | Screen Actors Guild Awards | Outstanding Performance by an Ensemble in a Drama Series | Won |
| 2006 | Teen Choice Awards | TV – Choice Actress: Drama/Action Adventure | Nominated |
| 2007 | Screen Actors Guild Awards | Outstanding Performance by an Ensemble in a Drama Series | Nominated |
| 2007 | Emmy Awards | Outstanding Supporting Actress in a Drama Series | Won |
| 2007 | Golden Globes | Best Supporting Actress – Series, Miniseries or Television Film | Nominated |
| 2007 | Teen Choice Awards | Choice TV Actress: Drama | Nominated |
| 2007 | Teen Choice Awards | Choice Movie Actress – Comedy | Nominated |
| 2007 | Young Hollywood Awards | Superstar Of Tomorrow | Won |
| 2007 | St. Louis Gateway Film Critics Association Awards | Best Supporting Actress | Nominated |
| 2007 | Satellite Awards | Best Actress in a Motion Picture, Comedy or Musical | Nominated |
| 2008 | Empire Awards | Best Actress | Nominated |
| 2008 | MTV Movie Awards | Best Female Performance | Nominated |
| 2008 | Teen Choice Awards | Choice TV Actress: Drama | Nominated |
| 2008 | Golden Globes | Best Supporting Actress – Series, Miniseries or Television Film | Nominated |
| 2008 | People’s Choice Awards | Favorite Female TV Star | Won |
| 2009 | Teen Choice Awards | Choice Summer Movie Star: Female | Nominated |
| 2009 | Satellite Awards | Best Actress in a Motion Picture, Comedy or Musical | Nominated |
| 2009 | Alliance of Women Film Journalists | Actress Most in Need of a New Agent | Nominated |
| 2010 | People’s Choice Awards | Favorite TV Drama Actress | Won |
| 2010 | ShoWest Motion Picture Industry Convention | Female Star Of The Year | Won |
| 2011 | People’s Choice Awards | Favorite Movie Actress | Nominated |
| 2012 | Alliance of Women Film Journalists | Actress Most in Need of a New Agent | Won/Tied |
| 2015 | BTVA Feature Film Voice Acting Award | Best Female Lead Vocal Performance in a Feature Film | Nominated |
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