Britain's Queen Elizabeth II visits the Floriade flower festival in Canberra on October 20, 2011. Photo courtesy: AFP

Britain's Queen Elizabeth II (2nd L) and Prince Philip (L) cruise on a navy barge on Lake Burley Griffin during their visit to Canberra on October 20, 2011. Photo courtesy: AFP

Britain's Queen Elizabeth II (R) and Prince Philip (L) cruise on a navy barge on Lake Burley Griffin during their visit to Canberra on October 20, 2011. Photo courtesy: AFP

Britain's Queen Elizabeth II (C) visits the Floriade flower festival in Canberra on October 20, 2011. Photo courtesy: AFP

Britain's Queen Elizabeth II receives flowers from nine-year-old Jessica Brewer during a visit to Floriade in Canberra on October 20, 2011. Photo courtesy: AFP

Britain's Queen Elizabeth II (2nd L) and Prince Philip (L), the Duke of Edinburgh, receive flowers from heart attack survivor Lily Haskins (R), age six, at the 'Floriade' flower festival in Canberra on October 20, 2011 during their 10-day tour. Photo courtesy: AFP

Britain's Queen Elizabeth II (R) and Prince Philip (L), the Duke of Edinburgh, arrive at the 'Floriade' flower festival in Canberra on October 20, 2011 during their 10-day tour. Photo courtesy: AFP