CHRIS BROWN & RIHANNA AT AMA REHEARSALS

Chris Brown came out to support his girlfriend, Rihanna, during her rehearsal time for the 2008 American Music Awards. The awards show will be held at LA's Nokia Theater and will air on ABC Sunday, November 23rd 8/7c.

Looks like she may be performing her new single, "Rehab," but then again she isn't much of a dancer onstage, so she could be singing anyone of her hits.

(PHOTOS: GETTY)