In case Justin Timberlake's ability to sing, dance and act ridiculously well didn't give him enough street cred, his recent appearance on 'Late Night with Jimmy Fallon' sealed the deal.

Timberlake stopped by 'Late Night' to promote his role in the much anticipated, 'The Social Network.' Gushing over the talent of house band, The Roots, launched Timberlake and Fallon into a full blown medley of rap classics from Sugarhill Gang's "Rapper's Delight" to Jay-Z's "Empire State of Mind," and everything in between.

If Timberlake's rapping chops aren't enough for you, Fallon's attempt at the Soulja Boy 'crank that' dance certainly will be. Watch the hilarious video after the jump!