Jimmy Fallon Collects on $100 Bet in Mega Celebrity Stunt on First ‘Tonight Show': VIDEO

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Robert DeNiro, Tina Fey, Joe Namath, Rudy Giuliani, Mariah Carey, Tracy Morgan, Joan Rivers, Kim Kardashian, Seth Rogen, Lindsay Lohan, Sarah Jessica Parker, Mike Tyson, Lady Gaga, and Stephen Colbert dropped by Jimmy Fallon's first Tonight Show gig in a single sketch to "welcome (him) to 11:30, bitch!"

Watch, AFTER THE JUMP...