Christina Aguilera
Christina might look like a beuty bombshell, but she's got a terrible reputation in the industry. She's got major issues with other celebrities, once calling Britney Spears and Beyonce Knowles-Carter fake for trying to adhere to a good girl image. Even worse, she did a lot of blackface onstage early in her career. Pop boyband The Wanted even went to a major publication just to reiterate that she was "the rudest person [they] had ever met."
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