Justin Bieber is flexing his 18-year-old directing muscles in his latest music video for "Beauty And A Beat."

Selena Gomez's sexy beau is getting wet and wild while holding a handheld video camera ... with the one and only Nicki Minaj by his side.

Earlier this week, Biebs claimed his computer was stolen along with personal footage.

Ironically, at the beginning of the video, a screen appears that reads, "In October of 2012, three hours of personal footage was stolen from musician Justin Bieber. The following footage was illegally uploaded by an anonymous blogger.”

So was the computer theft all a joke? Regardless, Justin and Nicki have no problem getting their grind on in the video.

This boy is on fire!