The pressures of fame can get to anyone, even people who have been in the music industry for years as adults. But things can be especally difficult for child stars, thrust into the limelight when other kids their age are finger painting and learning their times tables.
This week Robbie Williams said that he thought Justin Bieber would crash and burn before long, warning of the dangers of fame at an early age, and Bieber's already been spotted smoking pot.
But this is far from the first time we've seen a child star go slightly off the rails with lavish partying and erratic behaviour.
Gigwise takes a look at ten child stars who have grown into rebellious and sometimes troubled adults...