Justin Bieber
The Canadian pop star is not a stranger to controversy. Even though he has millions of adoring fans who idolize him, he wasn't always the nicest person to them. When he was much younger, he had a bit of a rebellious streak that really hurt his reputation.
Going Crazy
Bieber used to be the talk of Hollywood. He was found very guilty of spitting off of balconies and onto fans, peeing on restaurant buckets, and even stopping his shows to yell at audience members who didn't stop talking. He had a short fuse, and many people attributed it to the fact that he got famous so young. He seems to be doing better now that he's happily married and had a good, long hiatus from music.