FILE- 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 wedding ceremony in the Monaco Cathedral, South of France. When Kate Middleton, marries Britain's Prince William on upcoming Friday April 29, 2011, many are wondering about the design of her dress and if Middleton's choice will stand the test of time to elevate her to be a style icon of our age, like the high-necked, lace-sleeved gown did for Grace Kelly at her 1956 wedding to Prince Rainier of Monaco. But the dress design is still a secret "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)