WELLINGTON, NEW ZEALAND - APRIL 16:  Catherine, Duchess of Cambridge, Prince William, Duke of Cambridge and Prince George of Cambridge wave to the crowd before boarding a Royal Australian Air Force plane for their flight to Australia at Wellington Airport's military terminal April 16, 2014 in Wellington, New Zealand. The Duke and Duchess of Cambridge are on a three-week tour of Australia and New Zealand, the first official trip overseas with their son, Prince George of Cambridge.  (Photo by Hagen Hopkins/Getty Images)