The lights dimmed, and the Chanel show opened with Penélope Cruz and Brad Pitt on the catwalk. Cruz smouldered in a chic black polo neck and discreet diamonds, Pitt twinkly eyed in an open-necked white shirt. They gazed into each other’s eyes, flirted a little, and then – how could either of them resist? – embarked on a clandestine affair. View image in fullscreen ‘Practical clothes for the 21st century’ … a model on the runway at the Chanel show. Photograph: WWD/Getty Images Well, almost. Cruz was, in fact, sitting demurely in the front row in a leather skirt suit,...