Britain's Lady Louise Windsor turned 19 today. Lady Louise Alice Elizabeth Mary Mountbatten-Windsor, generally known as Lady Louise Windsor, is the elder child of the Earl and Countess of Wessex and Forfar. Louise was born on November 8, 2003. A niece of King Charles, Lady Louise is 15th in the line of succession to the British throne. Lady Louise is currently up at St Andrews University, studying English, History, Politics and Drama.