DIANE von Furstenberg was mugged in Madrid on Sunday. The head of the Council of Fashion Designers of America, who was in Spain to collect a Telva Fashion Award, tweeted: “I just got robbed in the street in front of the Thyssen museum . . . My wallet, cash and all my credit cards!!” The Belgian-born wife of billionaire Barry Diller later typed, “I am totally fine!! I hope it the worst thing that will happen to me. Getting a big prize tomorrow so going to sleep now.”