Have you been noticing lately that the older Justin Bieber grows, the lower his voice gets? Well, this is actually common for anyone who is starting to go to the phase of adulthood soon but this could mean big trouble for a star as big as Bieber.

In fact, with his recent Christmas music video with Mariah Carey where he was forced to sing it in the diva's tone, one can easily notice that he sang 'All I Want for Christmas' with a strained voice. And when you compare it with how his voice sounded way back for the song 'Baby,' it was then way smoother and more effortless.

This could probably be the reason why he chose to sang 'Let it Be' last New Year's eve so that he would only be required of a lower voice range. But according to an expert arranger, Owen Pallett, Bieber has a high chance of achieving a high tenor in just a couple of years or so as reported in NOW Toronto.

All that Bieber's got to do for now is get used to his new voice soon and just continue training to edge out those rough spots.

The young music superstar is set to start a career in the movies just like his girl Selena Gomez. He is rumoured to be acting alongside Mark Wahlberg for a basketball themed movie.

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