These days, stylish celebrities can’t quite seem to get enough of retro sneakers . Rihanna swears by her Puma Speedcats , Jennifer Lawrrence rarely leaves the house without her Adidas Tokyos , and Hailey Bieber has swiftly fallen for Onitsuka Tiger’s Mexico 66s . Gabrielle Union is the latest A-lister to endorse a vintage-inspired style—spotted in New York City this morning wearing a pair of black patent leather Nike Cortez sneakers . Defined by high-traction gum soles and a lightweight construction, the iconic Nike Cortez style debuted in the late ‘60s as the label’s first running shoe. But despite its sporty appeal, Union managed to elevate the look in a way that felt undeniably modern. On Thursday, May 7, Union stepped out in NYC wearing Nike Cortez sneakers.…