“Hairspray” director John Waters was candid when asked by Page Six why he’s annually in Los Angeles for the Oscars. “Fame maintenance,” he explained at a Gagosian Gallery bash in Beverly Hills for artist Richard Prince. New York-based producer and Giants owner Steve Tisch added at the art fete on Thursday: “If this were Detroit, Oscar week would be the Auto Show.” Larry Gagosian’s guests included Jeff Bezos, Evelyn and Lynn de Rothschild, former porn princess Sasha Grey, Peter Morton, rocker Anthony Kiedis, Marina Abramovic, Peter Brant and Terry Richardson. Pam Anderson was seen searching for Prince to congratulate him on selling every painting before his show even opened.