Jennifer Hudson performed at Clive Davi's Pre_Grammy Bash

*The music world celebrated Grammy weekend at tributes, rehearsals, parties and styling suites. Here’s a look:

PRE-PARTY BLOWOUT: Jennifer Hudson paid tribute to Barbra Streisand in song, Mary J. Blige gave a gut-wrenching performance in honor of her musical mentor and Rihanna made more than a fashion statement as the stars aligned for Clive Davis’ annual pre-Grammy blowout.

Davis’ party is always a must for the music industry’s A-listers, and they were out in force at the Beverly Hilton Hotel for Saturday’s gala: Jay-Z, Taylor Swift, the Black Eyed Peas, Jane Fonda, Usher, Quincy Jones, Wyclef Jean, Akon, Carrie Underwood and more mingled together at the exclusive event.

Rihanna hung out with gal pal Katy Perry and Perry’s new fiance, comedian Russell Brand, for much of the evening. Her appearance was notable because it was after she and then-boyfriend Chris Brown attended the Davis party last year that Brown assaulted her.

This year, she partied with friends like …

(Read MORE of this AP report by Nekesa Mumbi Moody, HERE.)

Also, See photos of Rihanna, Jamie Foxx, Mary J. Blige and lots more from the event, HERE.