The `Baby` singer has made the jokey video under the alias `Shawty Mane` in which he seeks to "prove his skills in the rap game."
In the video he is shown rapping in oversize glasses at a studio microphone and pulling hip hop moves on a street.
In the rap he references Lady Gaga and NFL star Tom Brady as well as saying he is "tearing up like a tractor".
At the end of the video he adds: "I`m JustinBieber, you might know me as the guy who sings `Baby`. I`m a pop singer, I`m white. But I wanted to do this to prove I`ve got skills in the rap game. So yeah, word up, I killed that, peace."
Justin was also today announced as the online host of MTV`s European Music Awards (EMAs), which take place in Madrid in November.
Video of the singer discussing the event will be streamed on the awards show`s website and Justin will also be taking to social media platforms, such as Facebook and twitter to discuss the happenings on the show, which will feature performances from Katy Perry and Shakira, among others.
Justin said: "I`m so excited to have all my fans come watch the show with me online. It will be like one giant, global viewing party at my house!"
The MTV EMAs, hosted by US actress Eva Longoria, will take place on November 7 and will be broadcast live on the channel.