Not only does Rihanna not want to sound like Katy Perry and Lady Gaga—she doesn't want to look like them either. Speaking to British newspaper the Mirror, the "Rude Boy" songbird recently explained that the three show-biz fashion plates have worked out a system to prevent them from showing up at high-profile events in the same clothes: "My worst nightmare would be a clash on the red carpet—so we all text each other before to make sure. We're all kind of fearless with fashion. So Katy and I speak all the time about what we're going to wear. And Gaga." And it's not.....