Joey Fatone from "N Sync" has some advice for Justin Beiber! He told the Huffington Post, "Don't be a douche. That's plain and simple. You get this bug from the celebrity thing, where you're very on top of the world and everyone's 'yessing' you to death, so you're like, 'I can get away with this. I can do that.' Not to say that he might be doing anything wrong -- or he might be in the wrong mix of people, in his camp." 

Fatone also added that although he knows Scooter Braun, Bieber's manager, and that he does a good job, Bieber is still young and it is inevitable he will make mistakes. 

Source: Huffington Post