Puberty can hit teen stars hard, just think back on the red-hot "young" careers of male soprano stars like Michael Jackson, Donny Osmond and Wayne Newton who took years to recover from their early high-note-singing highpoints to make it back to the top again.

Luckily for pop-phenom Justin Bieber, he's got Usher for a mentor and a voice coach who knows her stuff. Which you can clearly see in the sneak peek from Wednesday's E! special, Justin Bieber: My World. Bieber is deep, or at least he will be soon!

Follow @bieberdish on Twitter!

Tune in Wednesday @ 10 p.m. for the E! Entertainment Specials: Justin Bieber: My World!

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