Rihanna To Open the American Music Awards

This will mark Rihanna's fourth time performing on the AMAs as she will join other previously announced acts including Diddy-Dirty Money, Ne-Yo, Bon Jovi, P!nk, Christina Aguilera, Justin Bieber, Katy Perry, Ke$ha and Usher.

Rihanna is nominated for an AMA in the Soul/Rhythm & Blues category for Favorite Female Artist.