Rihanna stole the show at New York’s Metropolitan Museum of Art Gala when she swooped in wearing a fur-trimmed yellow cape with floral swirls of gold and a train so long it required three wranglers.Beyonce and her husband Jay Z arrived so late that many photographers were giving up and leaving. She was highly photogenic though, in a sheer, bejewelled Givenchy Haute Couture gown by Riccardo Tisci.