We're really girl crushin' on Ulyana Sergeenko lately. Not only did she design Kim Kardashian's showstopping silk corset dress for her sis Khloé's 30th birthday bash, but her street style is on point. Yesterday, she was snapped strolling around Paris (when she wasn't prepping for her epic runway show, held earlier today), and her hat totally nabbed our attention. Think it's too hot for some chic headgear? Think again! These bad boys will keep you in constant shade (big win during festival/beach season), and even allow you to give your sunnies a rest. Floppy, straw or even a trusty fedora: a hat is your heatwave BFF.