Puberty can hit teen stars hard. Just think back on the red-hot "young" careers of male soprano singers like Michael Jackson, Donny Osmond and Wayne Newton, who took years to recover from their early high-note-singing high points 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!
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Tune in Wednesday @ 10 p.m. for the E! Entertainment Specials: Justin Bieber: My World!