STOCKHOLM, SWEDEN- APRIL 30: Crown Prince Frederik, and Crown Princess Mary of Denmark attend a Lunch at City Hall Stockholm, on the occasion of King Carl Gustaf of Sweden's 70th Birthday, on April 30, 2016, in Stockholm, Sweden.(Photo by Julian Parker/UK Press via Getty Images)
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UK Press Julian Parker

STOCKHOLM, SWEDEN- APRIL 30: Crown Prince Frederik, and Crown Princess Mary of Denmark attend a Lunch at City Hall Stockholm, on the occasion of King Carl Gustaf of Sweden's 70th Birthday, on April 30, 2016, in Stockholm, Sweden.(Photo by Julian Parker/UK Press via Getty Images)
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UK Press Julian Parker

STOCKHOLM, SWEDEN- APRIL 30: Princess Martha Louise of Norway and Crown Princess Mary of Denmark attend The Swedish Armed Forces Celebration, in the Outer Courtyard at The Royal Palace in Stockholm on the occasion of King Carl Gustaf of Sweden's 70th Birthday, on April 30, 2016, in Stockholm, Sweden.(Photo by Julian Parker/UK Press via Getty Images)
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UK Press Julian Parker