"She's St. Lawrence as she breathes. Her allure, her mystery, her subversive side, an elusive, desirable danger. "It is in these terms that Anthony Vaccarello, current artistic director of Saint Laurent, describes Betty Catroux. She was "his double," "his twin," "his muse." He takes advantage of this exhibition to plunge into the former model's dressing room and select pieces emblematic both of her singular personality and of the decisive and permanent influence she had on the fashion house. Betty Catroux met Yves Saint Laurent in the nightclub Le New Jimmy's in 1967. The aesthetic love at first sight is immediate. For the designer, the young woman embodied an androgynous physical ideal that broke the codes of femininity and seduction. He then seeks to define himself and finds in Catroux's appearance and attitude the much sought-after subversion of gender that will become his trademark. While portraying this fashion icon photographed by the greatest, the exhibition traces the history of the "Saint Laurent style", inseparable from the silhouette of Betty Catroux, a true "feminine double" of the famous designer.