Fourteen celebrities pay Jimmy Fallon as he made his Tonight Show debut on Monday. Robert De Niro came out and handed Fallon a $100 dollar bill, followed by Tina Fey, Joe Namath, Rudy Giuliani, Mariah Carey, Joan Rivers, Kim Kardashian, Seth Rogen, Mike Tyson, Lady Gaga, Lindsay Lohan, Tracy Morgan and Sarah Jessica Parker. E