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Jimmy Fallon & Justin Timberlake Rap.

The pals performed a fifth installment of their popular segment on Friday, as they closed out Fallon's inaugural week as host of The Tonight Show.

The 33-year-old entertainer and the 39-year-old late-night host unleashed some classic tunes, including a medley of verses from hit makers LL Cool J, Run DMC, Tone Loc, Beastie Boys, Kendrick Lamar, Salt-N-Pepa, Jay Z, DJ Jazzy Jeff & the Fresh Prince and much more.