Grammy Nominations Concert

Singer Katy Perry poses in the press room during Grammy Nominations Concert on December 1, 2010, at Club Nokia in downtown Los Angeles. The 53rd annual Grammy Awards show will take place in Los Angeles on February 13, 2011. (AFP/Robyn Beck)

Katy Perry is seen backstage at the Grammy Nominations Concert on December 1, 2010, in Los Angeles. (AP/)

Musician Katy Perry attends the Grammy Nominations Concert Live at Club Nokia on December 1, 2010 in Los Angeles, California. The 53rd annual Grammy Awards show will take place in Los Angeles on February 13, 2011. (AFP/Gabriel Bouys)

Musician Katy Perry attends The Grammy Nominations Concert Live - Countdown to the Music's Biggest Night event in Los Angeles December 1, 2010. (REUTERS/Mario Anzuoni)

Singer Monica poses in the press room at the Grammy Nominations Concert, December 1, 2010 at Club Nokia in downtown Los Angeles. (AFP/Robyn Beck)

Rapper B.o.B and musician Bruno Mars (R) perform onstage during the Grammy Nominations Concert Live at Club Nokia on December 1, 2010 in Los Angeles, California. The 53rd annual Grammy Awards show will take place in Los Angeles on February 13, 2011. (AFP/Gabriel Bouys)

Songwriter/producers Ari Levine (L), Bruno Mars (C), and Philip Lawrence pose in the press room at the Grammy Nominations Concert, December 1, 2010 at Club Nokia in downtown Los Angeles. (AFP/Robyn Beck)

Pop music star Katy Perry performs during a rehearsal for the Grammy Nominations Concert, November 30, 2010 at Nokia Plaza at LA Live in downtown Los Angeles. (AFP/Robyn Beck)

Musician Dave Grohl and actress Selena Gomez announce the nominees for Song Of The Year during The Grammy Nominations Concert Live - Countdown to the Music's Biggest Night event in Los Angeles December 1, 2010. (REUTERS/Mario Anzuoni)

Singer Hayley Williams poses in the press room at the Grammy Nominations Concert, December 1, 2010 at Club Nokia in downtown Los Angeles. (AFP/Robyn Beck)

Singer Monica poses in the press room at the Grammy Nominations Concert, December 1, 2010 at Club Nokia in downtown Los Angeles. (AFP/Robyn Beck)

Musician Bruno Mars performs onstage during the Grammy Nominations Concert Live at Club Nokia on December 1, 2010 in Los Angeles, California. (AFP/Gabriel Bouys)

Singer Hayley Williams poses in the press room at the Grammy Nominations Concert, December 1, 2010 at Club Nokia in downtown Los Angeles. (AFP/Robyn Beck)

Rapper B.o.B performs onstage during the Grammy Nominations Concert Live at Club Nokia on December 1, 2010 in Los Angeles, California. (AFP/Gabriel Bouys)

Musician Stevie Wonder poses backstage at the Grammy Nominations Concert on December 1, 2010, in Los Angeles. (AP/)

Comedian Craig Ferguson (R) and host LL Cool J announce the nominees for Record Of The Year at The Grammy Nominations Concert Live - Countdown to the Music's Biggest Night event in Los Angeles December 1, 2010. (REUTERS/Mario Anzuoni)

Rapper B.o.B. poses in the press room at the Grammy Nominations Concert, December 1, 2010 at Club Nokia in downtown Los Angeles. (AFP/Robyn Beck)

Pop singer Katy Perry sings during a taped rehearsal for the Grammy nominations television special in Los Angles on November 30, 2010. (REUTERS/David McNew)

Pop singer Katy Perry sings during a taped rehearsal for the Grammynominations television special in Los Angeles on November 30, 2010. (REUTERS/David McNew)

Patrick Monahan and his band, Train, perform during a taped rehearsal for the GRAMMY nominations television special in Los Angles on November 30, 2010. (REUTERS/David McNew)