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STOCKHOLM, SWEDEN - DECEMBER 21: Princess Sofia of Sweden attend "Christmas in Vasastan" concert at Gustav Vasa church on December 21, 2015 in Stockholm, Sweden. (Photo by Michael Campanella/Getty Images)

STOCKHOLM, SWEDEN - DECEMBER 21: Princess Sofia of Sweden attend "Christmas in Vasastan" concert at Gustav Vasa church on December 21, 2015 in Stockholm, Sweden. (Photo by Michael Campanella/Getty Images)