Justin Bieber hides behind shades and a backtrack.

Chris Brown was the only artist who struggled through his performance at the 2013 Billboard Music Awards this evening. Justin Bieber also experience severe complications during the show as he “sang” an array of flat notes over an incredibly loud backtrack of “Take You”.

Bieber basically talked his way through his Billboard Music Awards performance as he missed several steps of his choreography. Why was he in even worse vocal shape than usual? Well, the answer was revealed when Bieber accepted the Top Male Artist award and his voice trembled as he spoke. It appears that puberty has finally caught up with the teen sensation.

Watch Bieber perform on the Billboard Music Awards below:

Thoughts?