This weekend, we are going to be popping along to the Saatchi gallery to see The Little Black Jacket exhibition which celebrates Karl Lagerfeld’s new book. With the help of ex-French Vogue editor Carine Roitfeld, Karl has photographed a fantastic array of stylish celebs wearing the classic Chanel little black jacket. It is fascinating to see the same garment worn in such different ways, along with the personality of the wearers coming through. Here are a few of the images on show, we love the picture of American Vogue editor Anna Wintour as even though she has her back to the camera, you know it is her. Her hair cut…