Bad: Kristen Stewart
...a home-wrecker! It looked like she had it all as one half of Hollywood's hottest couple, with millions of fans worldwide and all designers begging to dress her for red carpets. But it seemed life was too good for the Twilight star who was caught cheating on R-Patz with the married director of 'The Snow White and the Huntsman'. Is Kristen just starting her bout of bad-girl behavior?