It’s well past midnight at New York’s Daylight Studio, and Cardi B is fighting to stay awake. Five hours into her Billboard photo shoot, a slight wardrobe malfunction with her black dress is prompting a quick timeout. “S–t, I got a wedgie,” she groans, dropping into her seat with a smirk. But like a true New Yorker, she toughs it out — chewing ice and cracking jokes like she’s headlining her own late-night set. Clutching a Chick-fil-A cup, she rattles off a story about the fast-food chain botching her order. Then she seamlessly swerves into her recent social media spat...