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Prince Christian And Princess Isabella Of Denmark, Attend A Photocall For The Danish Royal Family At Grasten Castle In Southern Denmark. (Photo by Julian Parker/UK Press via Getty Images)

Prince Christian And Princess Isabella Of Denmark, Attend A Photocall For The Danish Royal Family At Grasten Castle In Southern Denmark. (Photo by Julian Parker/UK Press via Getty Images)

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AUBECHIES, BELGIUM - JULY 08: Prince Gabriel of Belgium and Prince Philippe of Belgium visit the educational centre 'Archeosite' on July 8, 2011 in Aubechies, Belgium. (Photo by Belgium Royal Pool/Getty Images)

AUBECHIES, BELGIUM - JULY 08: Prince Gabriel of Belgium and Prince Philippe of Belgium visit the educational centre 'Archeosite' on July 8, 2011 in Aubechies, Belgium. (Photo by Belgium Royal Pool/Getty Images)

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TAVERNELLE, ITALY - JULY 04: Princessess Alexia, Catharina Amalia and Ariane pose during a photo session on July 4, 2011 in Tavernelle, Italy. (Photo by Michel Porro/Getty Images)

TAVERNELLE, ITALY - JULY 04:  Princessess Alexia, Catharina Amalia and Ariane pose during a photo session on July 4, 2011 in Tavernelle, Italy. (Photo by Michel Porro/Getty Images)

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Crown Princess Mette-Marit Of Norway, And Prince Sverre Magnus, Celebrate Norway National Day At Skaugum, In Asker, Norway. (Photo by Julian Parker/UK Press via Getty Images)

Crown Princess Mette-Marit Of Norway, And Prince Sverre Magnus, Celebrate Norway National Day At Skaugum, In Asker, Norway. (Photo by Julian Parker/UK Press via Getty Images)

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PALMA DE MALLORCA, SPAIN - AUGUST 02: Princess Sofia of Spain arrives to the Real Club Nautico de Palma to attend Jaume Anglada's pop concert during the second day of 30th Copa del Rey Mapfre Audi Sailing Cup on August 2, 2011 in Palma de Mallorca, Spain. (Photo by Carlos Alvarez/Getty Images)

PALMA DE MALLORCA, SPAIN - AUGUST 02:  Princess Sofia of Spain arrives to the Real Club Nautico de Palma to attend Jaume Anglada's pop concert during the second day of 30th Copa del Rey Mapfre Audi Sailing Cup on August 2, 2011 in Palma de Mallorca, Spain.  (Photo by Carlos Alvarez/Getty Images)