J.K. Rowling — DETROYS SERENA WILLIAMS HATER … She’s Beautiful, You Moron!
J.K. Rowling just went all AVADA KEDAVRA on some pathetic cyber troll — EVISCERATING an “idiot” who talked smack about Serena Williams. ; The “Harry Potter” creator was giving mad props to Williams on Twitter for winning Wimbeldon — saying, “I…