I haven't pliéd behind a ballet barre since college, but I think about Capezio slippers almost every day. Today's biggest shoe trends all channel the whimsy of twirling to Tchaikovsky, from high-vamp flats to dainty Mary Janes. But the most stage-worthy of them all is the ballet sneaker trend, according to my favorite It girls. This time last year, the ballet sneaker trend—featuring rounded toe boxes and almost-invisible soles—declared itself the Misty Copeland of must-have shoes. Even during a season where chunky dad-core trainers reigned supreme, they made a spellbinding debut on Dua Lipa , Bella Hadid , and Hailey Bieber 's shoe racks. To no surprise, the sneakerinas assemblé -d into my closet faster than you could say Swan Lake . The same thing happened to my go-to VIPs for styling inspiration. Bieber, a former ballerina herself, belongs to Miu Miu 's ballet sneaker company—and has since October. Just last month, she endorsed the white sneaker revival in a $900 pirouette-proof pair.…