WARSAW, POLAND - JULY 17:  Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge with President Andrzej Duda (third right) and his wife, Agata, (second right) during a visit to the Warsaw Rising Museum on day 1 of their offical visit to Poland on July 17, 2017 in Warsaw, Poland.  (Photo by Jane Barlow -  Pool/Getty Images)
WARSAW, POLAND - JULY 17:  First Lady Agata Kornhauser-Duda and Catherine, Duchess of Cambridge look on as President Andrzej Duda and Prince William, Duke of Cambridge light a candle at the Warsaw Rising Museum on day 1 of their official visit to Poland on July 17, 2017 in Warsaw, Poland. The museum is dedicated to the uprising of 1944 which saw the Polish resistance attempt to liberate Warsaw from German occupation   (Photo by Samir Hussein/Samir Hussein/WireImage)
WARSAW, POLAND - JULY 17:  First Lady Agata Kornhauser-Duda (M), Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge visit the Warsaw Rising Museum during an official visit to Poland and Germany on July 17, 2017 in Warsaw, Poland. The museum is dedicated to the uprising of 1944 which saw the Polish resistance attempt to liberate Warsaw from German occupation.  (Photo by Karwai Tang/WireImage)
WARSAW, POLAND - JULY 17:  Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge at the Wall of Remembrance as they visit the Warsaw Rising Museum which is dedicated to the uprising of 1944 which saw the Polish resistance Home Army attempt to liberate Warsaw from German occupation on day 1 of their offical visit to Poland on July 17, 2017 in Warsaw, Poland.  (Photo by Jane Barlow -  Pool/Getty Images)
WARSAW, POLAND - JULY 17:  Catherine, Duchess of Cambridge speaks with WWII veteran during a visit  they visit the Warsaw Rising Museum on day 1 of their offical visit to Poland on July 17, 2017 in Warsaw, Poland.  (Photo by Jane Barlow -  Pool/Getty Images)