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Britain's Queen Elizabeth II (2nd R) and her husband Prince Philip, The Duke of Edinburgh (2nd L) pose with German President Joachim Gauck (R) and his partner Daniela Schadt (L) as they arrive for a receiving line and state banquet at the presidential Bellevue Palace in Berlin, on June 24, 2015. Queen Elizabeth II and her husband Prince Philip, The Duke of Edinburgh, are on an official visit to Germany until Friday, June 26. AFP PHOTO / RONNY HARTMANN / AFP / RONNY HARTMANN (Photo credit should read RONNY HARTMANN/AFP/Getty Images)

Britain's Queen Elizabeth II (2nd R) and her husband Prince Philip, The Duke of Edinburgh (2nd L) pose with German President Joachim Gauck (R) and his partner Daniela Schadt (L) as they arrive for a receiving line and state banquet at the presidential Bellevue Palace in Berlin, on June 24, 2015.  Queen Elizabeth II and her husband Prince Philip, The Duke of Edinburgh, are on an official visit to Germany until Friday, June 26.     AFP PHOTO / RONNY HARTMANN / AFP / RONNY HARTMANN        (Photo credit should read RONNY HARTMANN/AFP/Getty Images)