Superstar Rihanna joins the celebrations at the launch of the world's largest and most revolutionary cruise ship, Oasis of the Seas. She performs an exclusive concert onboard the superliner on Thursday November 19, 2009 and will be the first performer ever to take centre stage on Oasis of the Seas' AquaTheater, an amphitheater-style space that serves as a pool by day and dazzling oceanfront theater by night. Oasis of the Seas will set sail the following day on a private three-night inaugural cruise.