This just in from the other side of the pond: Hugh Grosvenor, the new duke of Westminster and godfather of Prince George, is now officially Britain's youngest billionaire. Although he just inherited $10.8 billion, the 25-year-old does indeed have a day job, working as an account manager for bio-bean, a London-based green technology company that turns coffee grounds into biofuels. Cute AND cares about the environment. Win!