Donald Trump might be generous, but he didn't tip a Santa Monica waiter $10,000 on Monday. The tycoon says he wasn't even in California. Derober.com published a copy of a MasterCard receipt showing that Trump tipped $10,000 on an $82.27 bill after dining at the Buffalo Club, but Trump told Page Six it was a hoax. "This was done by the stupid restaurant to get publicity," he said. ". . . It's not my signature." The Web site not only ran an interview with waiter Billy D but also posted a video of the supposed server walking to his car.