Our favorite musical duo is back!

Justin Timberlake reunited with his BFF Jimmy Fallon last night on "The Tonight Show," collaborating on the fifth installment of their epic "History of Rap" series.

This version -- one of the best yet -- included hit tracks from LL Cool J, Run DMC, the Beastie Boys, Outkast, Drake, Kanye West and more!

JT and JF didn't just show off their smooth rap skills -- they also added some comedy into the mix.


As Fallon rapped NWA's "Straight Outta Compton" and suddenly got in the camera's face, Timberlake quickly interjected, "Hey hey hey! Hold on a second! ... You're straight outta compton?!" And just in time too, as Fallon was about to drop some of the tune's naughty words.

The talk show host later complimented his guest for pulling off the five-minute-long jam session without breaking a sweat, saying, "I'm always passed out ... I'm a big, doughy sweat ball," Fallon joked. "And you're getting on a treadmill and running!"

We love these two together!

Watch the video above to see Justin and Jimmy put their rap skills to the test.

Justin's visit caps off a star-studded week on "The Tonight Show." Check out the gallery below to see who else stopped by Fallon's desk!


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