WARSAW, POLAND - JULY 17:  (NO UK SALES FOR 28 DAYS FROM CREATE DATE) Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge with President of Poland Andrzej Duda and the first Lady Agata Kornhauser-Duda attend the Queen's Birthday Garden Party at the Orangeryeduring an official visit to Poland and Germany on July 17, 2017 in Warsaw, Poland.  (Photo by Pool/Samir Hussein/Samir Hussein/WireImage)