Crown Prince Frederik and Crown Princess Mary of Denmark attend the Parliament and government's celebration of the 100th anniversary of the 1915 Danish constitution on June 4th, 2015 in Copenhagen.
Denmark's Crown Prince Frederik and Crown Princess Mary pose with a little girl on May 21, 2015 in Munich, Germany.
Crown Princess Mary of Denmark (at left in first photo) attends the Maternity Foundation's jubilee and the launch of the "Safe Delivery" app on April 22, 2015 in Copenhagen. (Photos by Bo Nymann/Her og Nu via Getty Images)
Left to right: Japan's Princess Tsuguko with her mother, Princess Takamado, and Denmark's Crown Prince Frederik and Crown Princess Mary at the official opening of the exhibition about Greenland in Tokyo on March 27, 2015. (Photo by KAZUHIRO NOGI/AFP/Getty Images)
Denmark's Crown Princess Mary and Crown Prince Frederik arrive at a traditional Japanese garden in Tokyo on March 26, 2015 to meet students and education workers. The Danish royal couple are on a three-day visit in Japan to promote Greenland. (Photo by YOSHIKAZU TSUNO/AFP/Getty Images)