It's official.
Daniel Radcliffe, aka Harry Potter, is the world's richest star under the age of 21. Not only is he the wealthiest teenager in the U.K., but on this year's Forbes list of top young earners, he surpassed Miley Cyrus to gain the title of "Hollywood's Most Valuable Young Star." And at age 20, with three more Harry Potter films before the franchise ends - including this week's "
Harry Potter and the Half-Blood Prince" - we're