The Tonight Show with Jimmy Fallon debuted last night and he had TONS of celebrities on!

U2, Kim K, Lady Gaga, Seth Rogan, Will Smith and so many more showed up for support Fallon in kicking off his new gig. 

Will Smith and Fallon did a little skit called the Evolution of Hip Hop Dance and they go through ALL the dances…past and present. 

Watch it below: