Tina Fey, Tracy Morgan, Kim Kardashian, Sarah Jessica Parker, Mariah Carey and more also make a suprise cameo to give $100 to Fallon each for betting that he'd never host 'Tonight Show'.
Jimmy Fallon got support from a lot of A-listers on his "Tonight Show" debut. The likes of Lady GaGa, Lindsay Lohan, Robert De Niro, Mariah Carey, Tina Fey, Tracy Morgan, Kim Kardashian, Seth Rogen, Sarah Jessica Parker, Mike Tyson and Joe Namath stopped by the show to pay their debt as they bet $100 each that Fallon would never host the talk show.
GaGa, appearing in a sexy fishnet outfit, whispered something to Fallon's ear before she made her way back to the backstage. Stephen Colbert came out the last, pouring a bucket of pennies over his new competitor and taking a selfie of them before saying, "Welcome to 11:30, b***h!" Fallon said, "Thanks for believing in me, guys!"
In his monologue, Fallon cracked a joke about Conan O'Brien's short "Tonight Show" hosting stint. "I'm Jimmy Fallon and I'll be your host ... for now," he said. He also recalled his childhood and introduced his parents who were sitting among the audience.
"My goal is just to make you laugh and put a smile on your face so that you go to sleep with a smile on your face and live a longer life. Isn't that the whole goal of what we're doing? To have fun?" he continued.
Still in the first "The Tonight Show with Jimmy Fallon" episode, he welcomed guest Will Smith, who later joined him for a taped bit called "The Evolution of Hip-Hop Dancing". U2 appeared as the musical guest, singing "Invisible" on the rooftop of Rockefeller Center. The band also had a chat with Fallon and the comedian asked them to close the show with an acoustic version of their song, "Ordinary Love".
Jimmy Fallon's $100 "Tonight Show" Bet:
Jimmy Fallon's First "Tonight Show" Monologue:
"Evolution of Hip-Hop Dancing" (w/ Jimmy Fallon & Will Smith):