Knockout Gigi Hadid stars in Stuart Weitzman’s spring 2017 advertising campaign, shot by renowned Peruvian fashion photographer Mario Testino. The stunning, minimalist black and white images feature the brand’s essentials for this season, including the statement-making, embellished “Décor” sneakers. The relaxed shooting, which oozes American glamour, is handy proof we can look sexy in an effortlessly chic and comfortable way…