The Duchess of Cambridge is officially a royal now. With less than 24-hours notice, Kate Middleton successfully carried out her first official solo engagement Wednesday by standing in for her father-in-law. Prince Charles was supposed to attend a charity dinner in London, but had to travel to Riyadh, Saudi Arabia, to pay respects to the late Crown Prince. So in stepped the princess. Not a bad Plan B! A palace aide told the BBC that ...