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FREDENSBORG, DENMARK - APRIL 01: Crown Prince Frederik and Crown Princess Mary with their children during Prince Felix' confirmation at Fredensborg Palace church on April 1, 2017 in Fredensborg, Denmark. Prince Felix is 14 years old and number 8 in succession to the throne. (Photo by Ole Jensen - Corbis/Corbis via Getty Images)

FREDENSBORG, DENMARK - APRIL 01: Crown Prince Frederik and Crown Princess Mary with their children during Prince Felix' confirmation at Fredensborg Palace church on April 1, 2017 in Fredensborg, Denmark. Prince Felix is 14 years old and number 8 in succession to the throne.  (Photo by Ole Jensen - Corbis/Corbis via Getty Images)

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COPENHAGEN, DENMARK - JUNE 5: Crown Princess Mary of Denmark at Christiansborg Palace on the occasion of The 100th Anniversary of The 1915 Danish Constitution, on June 5th, 2015 in Copenhagen, Denmark (Photo by Julian Parker/UK Press via Getty Images)

COPENHAGEN, DENMARK - JUNE 5:  Crown Princess Mary of Denmark at Christiansborg Palace on the occasion of The 100th Anniversary of The 1915 Danish Constitution, on June 5th, 2015 in Copenhagen, Denmark  (Photo by Julian Parker/UK Press via Getty Images)

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AACHEN, GERMANY - JUNE 25: (L-R) Crown princess Mary of Denmark and Princess Benedikte of Denmark wave to the fans out of a carriage during the Opening Ceremony during day one of the 2013 CHIO Aachen torunament on June 25, 2013 in Aachen, Germany. (Photo by Christof Koepsel/Bongarts/Getty Images)

AACHEN, GERMANY - JUNE 25:  (L-R) Crown princess Mary of Denmark and Princess Benedikte of Denmark wave to the fans out of a carriage during the Opening Ceremony during day one of the 2013 CHIO Aachen torunament on June 25, 2013 in Aachen, Germany.  (Photo by Christof Koepsel/Bongarts/Getty Images)

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YEOSU, SOUTH KOREA - MAY 12: THR Prince Frederik of Denmark and Crown Princess Mary of Denmark visit at the 2012 Yeosu Expo on May 12, 2012 in Yeosu, South Korea. The Crown Prince and Crown Princess of Denmark are on a six-day visit to South Korea. (Photo by Chung Sung-Jun/Getty Images)

YEOSU, SOUTH KOREA - MAY 12:  THR Prince Frederik of Denmark and Crown Princess Mary of Denmark visit at the 2012 Yeosu Expo on May 12, 2012 in Yeosu, South Korea. The Crown Prince and Crown Princess of Denmark are on a six-day visit to South Korea.  (Photo by Chung Sung-Jun/Getty Images)

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Crown Princess Mary Of Denmark, Attends The Opening Of The Exhibition, At Scandinavia House In New York, ' Luminous Modernism, Scandinavian Art Comes To America 1912 '. (Photo by Julian Parker/UK Press via Getty Images)

Crown Princess Mary Of Denmark, Attends The Opening Of The Exhibition, At Scandinavia House In New York, ' Luminous Modernism, Scandinavian Art Comes To America 1912 '. (Photo by Julian Parker/UK Press via Getty Images)