Wacky designer Betsey Johnson practiced anger management at the New York City Ballet spring gala — dragging a model down the red carpet by a leash. Inspired by the performance of “The Seven Deadly Sins,” Johnson and her model, Stephanie Wagenman, traded in fluffy pink tutus for black dresses, black pointe shoes, body paint and a leash, which Betsey fastened on Wagenman, who was dubbed “anger.” A spy told us the act amazed guests and “nearly knocked Sarah Jessica Parker off her heels.”