Jimmy Fallon brought a popular 'Late Night' segment over to 'The Tonight Show' with him. The first challenger in the comedian's famous lip sync battle? Paul Rudd!

Jimmy reminded the audience that the competitors don't know what songs the other picked, making the competition all the more fierce.

We don't know which was more amazing -- Paul channeling Tina Turner or Jimmy covering Foreigner. As expected, the two funny men totally got into the game, and the result was hilarious.

Watch it all go down in the video above!