You'e GOT to hear this!

Justin Bieber challenged our multi-talented videographer to a rap-off and our dude KILLED IT!

During a hike with some friends Friday, Justin Bieber, after a little caffeine boost from Starbucks in the form of an iced coffee, hiked to the top of the hill, posed with the American flag in a burst of patriotism, and then when he hiked down, he and his friends started a rap battle!

Watch and listen (top video)!