Showtime! Rihanna, Usher, Justin Bieber & More Perform At 2010 American Music Awards [VIDEO]

There are only three reasons we really check out award shows: to peep the fashion mishaps on the red carpet, loudly protest the most unjust award winners (secretly hoping Kanye will pop up as the voice of reason) and lastly, to peep the onstage triumphs and train wrecks. As for the latter, the 2010 American Music Awards had a little of both, with the likes of Rihanna, Ke$ha, Dirty Money, Usher, Ne-Yo, Christina Aguilera taking the stage. Peep the performances that mattered most below and let us know who killed it... and who butchered it.

Rihanna