Models Kendall Jenner and Gigi Hadid were caught enjoying some behind-the-scenes down time fun with the ever popular selfie stick during a recent Vogue photoshoot with internationally renowned fashion photographer Mario Testino. Their playful shenanigans can be seen below, as the fashionable beauties take selfies with Testino and other celebrities including Justin Bieber, Ansel Elgort, Cody Simpson and Kris Jenner.