Jennifer Mitchell / MEGA; (C) MATRIXPHOTOS.COM / MEGA They were once the closest of friends. For years, Princess Diana and Sarah Ferguson were two women bound by the surreal experience of marrying into Britain's most famous family. The royal brides - Diana wed the future King Charles III in 1981, while Fergie married his brother Andrew Mountbatten-Windsor, the former Duke of York, in 1986 - shared inside jokes, private struggles and a rare understanding of what life was really like behind palace walls.