Cardi B proves she’s a superstar by flexing her massive show rate. A conversation about hip-hop superstars arose on Twitter over the weekend as TDE President Punch wondered who tomorrow’s mega-stars would be. He named Jack Harlow, Doja Cat, Lil Nas X, and Baby Keem as possible suitors for the role, and one person responded to him by adding Megan Thee Stallion and Cardi B to that …