In this April 19,1956 file photo, Princess Grace Kelly waves to cheering crowds lining the road as she rides in an open car with Prince Rainier III following their marriage in a religious wedding ceremony in the Monaco Cathedral, South of France. Kate Middleton, bride-to-be of Britain's Prince William, has managed to keep the design of her dress secret. With just two days to go, the world still knows next to nothing about what Prince William's bride will wear to mark her transition from commoner to princess. "They've done an amazing job at keeping it secret," said Darcy Miller, editorial director at Martha Stewart Weddings. "The secrecy of the designer is making it more of an obsession" for brides and millions of royal fans everywhere, she added.(AP Photo, file))