Princess Sirivannavari of Thailand browsed breakfast cereals in a tiara: Keira Knightley lingered by the cheese counter; Karl Lagerfeld took VIPs shopping on Tuesday at the “Chanel Supermarket” complete with fully-stocked aisles, check-outs, trolleys, special offers and discount posters. Always widely anticipated as one of “the events” of Paris fashion, Lagerfeld transformed the city’s vast Grand Palais into a life-sized supermarket. Melanie Griffith, Vanessa Paradis and Mario Testino bolstered the front row while star models Cara Delevingne and Kendall Jenner, sister of Kim Kardashian, were on the catwalk.