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AP Photo/Matt Sayles
Katy Perry performs during a rehearsal for the Grammy Nominations Concert on Nov. 30, 2010, in Los Angeles.
PICTURES: Katy Perry PHOTOS: Scenes from the Show PHOTOS: Stars in the Press Room SPECIAL SECTION: Awards Season
AP Photo/Matt Sayles
Katy Perry performs during a rehearsal for the Grammy Nominations Concert on Nov. 30, 2010, in Los Angeles.
PICTURES: Katy Perry PHOTOS: Scenes from the Show PHOTOS: Stars in the Press Room SPECIAL SECTION: Awards Season
AP Photo/Matt Sayles
Katy Perry performs during a rehearsal for the Grammy Nominations Concert on Nov. 30, 2010, in Los Angeles.
PICTURES: Katy Perry PHOTOS: Scenes from the Show PHOTOS: Stars in the Press Room SPECIAL SECTION: Awards Season
Kevin Winter/Getty Images
Katy Perry performs during a rehearsal for the Grammy Nominations Concert on Nov. 30, 2010, in Los Angeles.
PICTURES: Katy Perry PHOTOS: Scenes from the Show PHOTOS: Stars in the Press Room SPECIAL SECTION: Awards Season
AP Photo/Matt Sayles
Singer Pat Monahan, of Train, performs during a rehearsal for the Grammy Nominations Concert on Nov. 30, 2010, in Los Angeles.
PHOTOS: Scenes from the Show PHOTOS: Stars in the Press Room SPECIAL SECTION: Awards Season
AP Photo/Matt Sayles
Singer Pat Monahan, of Train, performs during a rehearsal for the Grammy Nominations Concert on Nov. 30, 2010, in Los Angeles.
PHOTOS: Scenes from the Show PHOTOS: Stars in the Press Room SPECIAL SECTION: Awards Season
ROBYN BECK/AFP/Getty Images
Katy Perry performs during a rehearsal for the Grammy Nominations Concert on Nov. 30, 2010, in Los Angeles.
PICTURES: Katy Perry PHOTOS: Scenes from the Show PHOTOS: Stars in the Press Room SPECIAL SECTION: Awards Season
Kevin Winter/Getty Images
Katy Perry performs during a rehearsal for the Grammy Nominations Concert on Nov. 30, 2010, in Los Angeles.
PICTURES: Katy Perry PHOTOS: Scenes from the Show PHOTOS: Stars in the Press Room SPECIAL SECTION: Awards Season
Kevin Winter/Getty Images
Singer Pat Monahan of the rock band Train performs during a rehearsal for the Grammy Nominations Concert on Nov. 30, 2010, in Los Angeles.
PHOTOS: Scenes from the Show PHOTOS: Stars in the Press Room SPECIAL SECTION: Awards Season
Kevin Winter/Getty Images
Singer Katy Perry, right, performs during a rehearsal for the Grammy Nominations Concert on Nov. 30, 2010, in Los Angeles.
PHOTOS: Scenes from the Show PHOTOS: Stars in the Press Room SPECIAL SECTION: Awards Season
Kevin Winter/Getty Images
Singer Katy Perry, center, performs during a rehearsal for the Grammy Nominations Concert on Nov. 30, 2010, in Los Angeles.
PHOTOS: Scenes from the Show PHOTOS: Stars in the Press Room SPECIAL SECTION: Awards Season
Kevin Winter/Getty Images
Singer Pat Monahan of the rock band Train performs during a rehearsal for the Grammy Nominations Concert on Nov. 30, 2010, in Los Angeles.
PHOTOS: Scenes from the Show PHOTOS: Stars in the Press Room SPECIAL SECTION: Awards Season
Kevin Winter/Getty Images
Rapper/host LL Cool J, left, and Neil Portnow, president of the National Academy of Recording Arts and Sciences, pose during a rehearsal for the Grammy Nominations Concert on Nov. 30, 2010, in Los Angeles.
PHOTOS: Scenes from the Show PHOTOS: Stars in the Press Room SPECIAL SECTION: Awards Season
Kevin Winter/Getty Images
Katy Perry performs during a rehearsal for the Grammy Nominations Concert on Nov. 30, 2010, in Los Angeles.
PICTURES: Katy Perry PHOTOS: Scenes from the Show PHOTOS: Stars in the Press Room SPECIAL SECTION: Awards Season
ROBYN BECK/AFP/Getty Images
Katy Perry performs during a rehearsal for the Grammy Nominations Concert on Nov. 30, 2010, in Los Angeles.
PICTURES: Katy Perry PHOTOS: Scenes from the Show PHOTOS: Stars in the Press Room SPECIAL SECTION: Awards Season
AP Photo/Matt Sayles
LL Cool J speaks during a rehearsal for the Grammy Nominations Concert on Nov. 30, 2010, in Los Angeles.
PHOTOS: Scenes from the Show PHOTOS: Stars in the Press Room SPECIAL SECTION: Awards Season
Kevin Winter/Getty Images
Katy Perry performs during a rehearsal for the Grammy Nominations Concert on Nov. 30, 2010, in Los Angeles.
PHOTOS: Scenes from the Show PHOTOS: Stars in the Press Room SPECIAL SECTION: Awards Season
