Guns N' Roses -- Celeb Fans Flock to Reunion Gig ... If They Had the Juice (PHOTOS & VIDEO)

The Guns N' Roses reunion show at the Troubador wasn't a concert, it was really a celebrity round of ... "Who's Got More Pull?" In other words, who's got enough weight in Hollywood to get a golden GNR ticket -- and the winners ran the gamut: Nicolas…