An ad campaign featuring actress Keira Knightley is set to debut next month. This is her second time shooting for the fragrance (the first was three years ago), and in addition to print ads composed by Mario Testino, the campaign includes a short film, which was just released last week. Set in Paris, Knightley once again plays the lead role, “Coco Mademoiselle,”  this time with an urban chic appeal…