Mariah Carey
If you're talking about terrible celebs, Mariah's name has surely come up. Aside from the baseline rudeness of not paying her staff, she also has a laundry list of diva behavior such as having people push her around in chairs. Not only that, but her demands for things that she should have on tour are kind of insane. She wants specifically "gold faucets" as well as newly purchased toilet seats in her hotel room. Okay, relax Mariah!