Music's biggest stars announce the nominees for the 2012 Grammys
Lady Gaga, Usher, Ludacris, Rihanna, The Band Perry and Sugarland hit the stage to rock the house at the "Grammy Nominations Concert Live!" show, hosted by LL Cool J at the Nokia Theatre in Los Angeles.
Check out photos of the celebrity presenters and musical guests who came to celebrate the countdown to music's biggest night.
"The Grammy Nominations Concert Live!" aired Wednesday, November 30, at 10 p.m. on CBS.