Jimmy Fallon’s long-awaited Tonight Show debut aired last night with official guests Will Smith and U2 and unofficial guests Robert De Niro, Lady Gaga, Tracy Morgan, Lindsay Lohan, Kim Kardashian, Joan Rivers, Mike Tyson, Joe Namath, Mariah Carey, and Stephen Colbert. Above, watch the fantastic string of celebrity cameos who begrudging gave Fallon the $100 they all owed him for making it to The Tonight Show, then click through to check out some of the night’s best moments, including Fallon’s first Tonight Show monologue and his “Evolution of Hip-Hop Dancing†sketch with Will Smith.