HILLEROD, DENMARK - MAY 24:   In this handout image provided by MEW and The National History Museum, Crown Prince Frederik of Denmark,  Crown Princess Mary of Denmark with children Prince Christian, Princess Isabella and the royal twins Princess Josephine and Prince Vincent during the unveiling of a portrait of Crown Prince Frederik by Australian painter Ralph Heimans at Frederiksborg Palace on May 24, 2018 in Hillerod, Denmark. The exhibitions 'Ralph Heinmans Portraits' and 'HRH Crown Price Frederik - Prince of Denamrk' both open on the occasion of the 50th birthday of The Crown Prince Frederik of Denmark. (Photo by Handout / MEW / The National History Museum)