Justin Timberlake and Jimmy Fallon Made Another "History of Rap" Mash-up (VIDEO)

Please enjoy this latest (fourth) installment of Justin Timberlake and Jimmy Fallon's "History of Rap" shenanigans, which closed out Timberlake's week of appearances on Late Night with Jimmy Fallon last night. "This is the last time..." Timberlake said. "Until the next time we do this," Fallon said. Happy Saturday!

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