Kristen Stewart's latest photo shoot isn't what you'd typically expect from the actress. On Saturday, world-renowned photographer Mario Testino shared a stunning yet very naked photo of Kristen on Instagram. In the black-and-white snap, Kristen is shown in the buff with nothing but a towel draped over her shoulder. The actress is the latest star to join Mario's Towel Series, which includes celebrities like Kate Moss, Selena Gomez, and Blake Lively. Take a look at Kristen's steamy picture, above, then check out Gigi Hadid and Cody Simpson's sexy shot from the series.