Jennifer Lawrence, Gemma Arterton, Celine Dion, Anna Wintour, Chiara Ferragni, Elizabeth Olsen, Robert Pattinson, Natalie Portman, Karlie Kloss, Sandrine Kiberlain, Marisa Berenson, Bernard Arnault, Helene Mercier-Arnault, Alber Elbaz, Bianca Jagger and more front row at the Dior Couture Fall Winter 2017 fashion show in Paris