HAMBURG, GERMANY - MARCH 20: Queen Maxima and King Willem-Alexander of The Netherlands sign the golden book of the city of Hamburg at the townhall of Hamburg on March 20, 2015 in Hamburg, Germany. (Photo by Christian Augustin/Getty Images)
HAMBURG, GERMANY - MARCH 20: Queen Maxima and King Willem-Alexander of The Netherlands sign the golden book of the city of Hamburg at the townhall of Hamburg on March 20, 2015 in Hamburg, Germany. (Photo by Christian Augustin/Getty Images)