(FILES) In this file photo taken on April 29, 2011 Britain's Prince William and his wife Kate, Duchess of Cambridge, wave as they travel in the 1902 State Landau carriage along the Processional Route to Buckingham Palace after their wedding service, in London. - William and Kate have brought a more relaxed and personal approach to royal duties and are raising their children in relatively hands-on fashion, presenting a more modern vision of the monarchy for a new age. The well-liked couple, formally known as the Duke and Duchess of Cambridge, married in 2011 and have presented themselves and their three children -- George, Charlotte and Louis -- as a model family. (Photo by Paul ELLIS / AFP)