1. Katy Perry, Justin Bieber, Bruno Mars Perform At Grammy Nominations

    December 02, 2010 1:15 PM EST 0 0 0 It seemed that every big name in pop music was on hand for "GRAMMY Nominations Concert Live!!" hosted by LL Cool J last night (Dec. 1). And while everyone was there hoping to hear their name called in the list of nominees , quite a few wer ...