JK Rowling's secret life as a 'party animal': From 'lavish' celebrations to sun-soaked trips on her $150million superyacht, the billionaire's wild side is revealed as she turns 60
More than a decade on from the whirlwind success of the Harry Potter films, Rowling, who turned 60 this week, for the most part maintains a low-profile existence at her £2million estate near Edinburg…