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They refuse to talk to their drivers.
In case you didn't know, most musicians get a tour rider when they go on the road, in which case they get to stipulate the food they want backstage, what kind of decor they want in their dressing room -- stuff like that. Katy Perry's rider, however, has a strange request: Her drivers are not allowed to start a conversation with Katy, her guests or her fans. Mum's the word, Katy!
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