Continuing to hone his skills, Justin Bieber has ventured into the world of rapping, and he has a Twitter video to prove it. The “Baby” singer shows off his word-smithing ability by rhyming along to a track that he has titled “Speaking in Tongues.” On his webpage, Justin explained, “Speaking in tongues freestyle… who knew I could rap lol. My alter ego rap name is Shawty Mane… hah.” Some of Bieber’s choice lyrics include, "Call up Lady Gaga on my on my telephone/ Hello doll/ You're my girl/ Beats no metronome. So I'm raptor/ Tearing it up like a tractor/ Matter fact you're n...