Justin Bieber having a mental breakdown!! Losing weight & exhausted

Justin Bieber is allegedly on the brink of having a 'mental breakdown' after claims that he is finding it hard to deal with the pressures of fame and his hectic work schedule.

Reports suggest that the 16-year old singing sensation lost over 10 pounds in weight and even collapsed at a gig last month after suffering from 'exhaustion.'

According to the National Enquirer, the Somebody To Love