I'm the king of the world ' That was the cry from Leonardo DiCaprio as he stood astride the bow in Titanic - the movie that would go on to smash all records, raking in a whopping GBP1.1 billion worldwide. Now, few Hollywood movers and shakers would dispute that statement as Leo has rocketed to become the highest paid actor in the world, earning as estimated GBP50 million in 2011 alone. And his position looks sets to be secure for some time to come...