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Grammy Nominations Rehearsals

December 1, 2010 / 7:06 PM EST / CBS News

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