When Kendall Jenner first posed for Mario Testino, her agent predicted these would be photos for her to remember. Every shoot since has left just as striking an impression, gracing the covers of Vogue, as well as Kris Jenner’s home screen. Whether shooting with her childhood friends, Justin Bieber and the Hadid sisters, or being transformed into a 70s starlet, Kendall’s friendship with Mario is transformative, memorable – and just beginning.