Always in bold costumes, Lady Gaga, Rihanna and Katy Perry have a secret to wear the same clothes on red carpets. According to Rihanna, the singers often exchange text messages to avoid the dreaded "who wore it better”. * "That would be my worst nightmare. So we sent each other a message. Just to make sure we’re different" she said. Only one detail intrigued Glamurama: Lady Gaga recently revealed that she’s terrified by cell phone because she thinks they can develop a brain tumors.