The film adaptation of erotic thriller Fifty Shades Of Grey has hit a new box office milestone after surpassing the $500 million (£313 million) mark on World Book Day (05Mar15). The movie version of E.L. James' popular novel, starring Jamie Dornan as kinky billionaire businessman Christian Grey, was released around the world on Valentine's Day weekend (14-15Feb15) and has continued to dominate the global box office charts for the past three weeks.