15 Unforgettable Moments From Jimmy's First Week On "The Tonight Show"

Gaga, FLOTUS, and The Ragtime Gals in a mere five days? What a week!

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4. When 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, and Stephen Colbert all gave Jimmy the $100 they owed him.

13. When Kathy Lee Gifford crashed Brian Williams' and Lester Holt's rendition of "Rapper's Delight."

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As the lyrics go, "Well so far you've heard my voice but I brought two friends along."

...but they didn't stay out of sync for too long.

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