The skin secrets of Cara Delevingne, Sienna Miller, Rosie Huntington-Whiteley and more. Prev5 of 31Next Image by Getty KRISTEN STEWART “For my skin, I use the whole Proactiv range. It really, really works for me; I’ve used it since I was a teenager.” Proactiv Skincare, from £17 Prev5 of 31Next