But Luda can't be on hand to perform his part every time Justin hits the stage. So who fills in for the rapper? Justin himself. JB has shown audiences his flow during many live performances of 'Baby,' including the times he appeared on the 2010 Kids Choice Awards, the View and the Tonight Show With Jay Leno.
"...To top it off I got to have a dream come true by getting to sing on the TONIGHT SHOW," Justin wrote on his Facebook page. "And I rapped."
But who's a better rapper on the song -- Justin or Ludacris? Most fans are probably used to Luda spitting rhymes on the original version of the 'My World 2.0' single, but true Beliebers might feel that the song is better with Justin performing it all the way.
in the end, Justin would rather leave the rhymes to Ludacris. "Sorry, Luda," Justin continued. "I'm not as good as u." Which music star would win in a 'Baby' rap battle? Watch Justin perform his single live, and then compare it to the official video for 'Baby' below so you can make the call.
When I was 13 I had my first love,
there was nobody that compared to my baby
and nobody came between us, no-one could ever come above
She had me going crazy, oh I was star-struck,
she woke me up daily, don't need no Starbucks.
She made my heart pound, I skip a beat when I see her in the street and
at school on the playground but I really wanna see her on the weekend.
She knows she got me dazing coz she was so amazing
and now my heart is breaking but I just keep on saying...