If there's one model who can stop us dead in our tracks, it's Irina Shayk. The supermodel posted a sultry bikinigram of herself wearing a brand-new Burberry swimsuit designed by her close friend Riccardo Tisci. If you were looking at getting your hands on Irina's bikini, you're out of luck. Apparently, the swimsuit hasn't even hit stores yet! Irina captioned the photo, "When you get new swimsuit by Riccardo Tisci and Burberry . . . that is not out yet." Read on to see her string two-piece and buy similar versions for your next vacation.