Piaget turns 20! And who’s the special guest to be their brand ambassador? Sienna Miller! Keeping in mind the brand and its ambassador, the celebrations see the release of Possession, a series of jewelry and watches. The photo shoots for both will be done at the Hudson Studios, New York by Elissa Santisi. Sienna will be styled with the help of makeup expert Gucci Westman, hair stylist Esther Langham and manicurist, Jin Soon. The release will be backed up with a “making-of” video as well.