CANBERRA, AUSTRALIA - APRIL 24:  Prince William, Duke of Cambridge, Catherine, Duchess of Cambridge and Her excellency Lady Cosgrove listen to an address by the Governor General Peter Cosgrove during a reception hosted by the Governor General Peter Cosgrove at Government House on April 24, 2014 in Canberra, 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 Stefan Postles/Getty Images)