The Singer: Justin Bieber
His Rap Resume: The Biebs unleashed his alter ego "Shawty Mane" onto the world last year when he dropped a freestyle of him spitting on Cam'Ron and Vado's "Speakin' Tungs."
Why He Should Stop Trying To Rap Immediately: Um, do we really need to explain this one? The freestyle Bieber dropped was cute and all, but we hope he never (ever!) decides to do it again. Stick to making tweens girl swoon, JB.