I hate including him and yet to leave him off the very top of this list would be a massive oversight. He is the poster child for being embarrassed by attempts to be grown up. He will forever be the (low) standard of making a terrible crossover. Take a trip down memory lane with me... Discovered singing on Youtube at the age of fourteen by Scooter Braun and Usher, Bieber was plucked from obscurity and placed straight into the hearts of teenage girls everywhere. His debut EP My World spawned four singles and the lead single from his debut album, Baby, was a worldwide hit. The film of his life, Never Say Never, was also a worldwide hit. All of this before the age of eighteen. How could it possibly go wrong? Spectacularly, is the answer to that question. There's embarrassing yourself when trying to be an adult and then there's spitting on your fans, abandoning your pet monkey in Germany, drag racing in residential areas while under the influence, destroying your neighbour's house and just generally acting like a fool does when they're given a lot of money and deprived of anyone to say no to them. Justin's still in his teens and there is still time for him to get his act together, but his behaviour these past couple of years has been disgraceful, the sort of trying to prove you're an adult that only results in people thinking you're nothing but a spoiled immature idiot, the sort that guarantees that no-one will respect you as an adult. He compounded this by actually smiling in his mugshot from January 23rd. A petition to deport him from the USA has garnered enough signatures to force the White House to release a statement about it. Here's hoping the threat of that might make him think twice about his attitude.