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OLAND, SWEDEN - JULY 14: Prince Daniel, Duke of Vastergotland and Princess Estelle of Sweden at the 38th birthday celebrations for Crown Princess Victoria at Solliden on July 14, 2015 in Oland, Sweden. (Photo by Mark Cuthbert/UK Press via Getty Images)

OLAND, SWEDEN - JULY 14:  Prince Daniel, Duke of Vastergotland and Princess Estelle of Sweden at the 38th birthday celebrations for Crown Princess Victoria at Solliden on July 14, 2015 in Oland, Sweden.  (Photo by Mark Cuthbert/UK Press via Getty Images)