Rapper Kanye West celebrated his chart victory over rival 50 Cent at GQ magazine's 50th anniversary party on Tuesday night (18Sep07), partying with Beyonce, SHAWN 'JAY-Z' CARTER and Sean Combs. West's new album Graduation beat 50 Cent's Curtis to the top of the U.S. and U.K. charts after they were released on the same day (11Sep07).