SYDNEY, AUSTRALIA - APRIL 16:  Prince George of Cambridge shakes the Govenor General's wife, Lynne Cosgrove's hand as he arrives with Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge at Sydney Airport on a Australian Airforce 737 aircraft on April 16, 2014 in Sydney, Australia. 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 Samir Hussein/WireImage)