The skin secrets of Cara Delevingne, Sienna Miller, Rosie Huntington-Whiteley and more. Prev15 of 31Next Image by Getty KATE BOSWORTH “I love SK-II’s sheet mask. It tightens, it brightens — it makes my face look like it’s had a good night’s sleep, when I could have had no sleep. It’s the best quick fix I’ve come across for skin.” SK-II Facial Treatment Mask, £60 for a pack of six Prev15 of 31Next