Justin Bieber - Speaking In Tongues - Shawty Mane

The teen sensation has taken the world by storm with his singing.

On top of that his business enterprises are growing by the day, with his latest venture a nail polish line aimed at his army of female fans.

And now he's posted a video demonstrating his lyrical skills.

Under the alias Shawty Mane, Justin performs Speaking In Tongues - a tongue-in-cheek rap song.

Funnily enough, despite his "street"-style performance, Justin actually looks quite the geek in his glasses