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)

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)