Before Robert Pattinson auditioned for the part of Edward the vampire in Twilight, he took a quarter of a Valium to see where it would take him. He got the part. He had no idea what he’d signed up for: he might have been aware that Stephenie Meyer’s Twilight saga had attracted 17m readers worldwide and that the Mormon mother from Arizona was the biggest publishing phenomenon since JK Rowling. What he didn’t see coming were the teen girls who’d fallen in love with the sensitive, tortured Edward of Meyer’s books. First they revolted online, calling Pattinson a gargoyle – and worse. Then they changed their minds, fell in love with him en masse and refused to leave him alone.