STOCKHOLM, SWEDEN - APRIL 30: Queen Silvia, Crown Princess Victoria of Sweden, Prince Daniel Princess Estelle, Prince Oscar and Princess Sofia attend the birthday celebrations of the King at the Royal Palace on April 30, 2017 in Stockholm, Sweden. (Photo by Patrick van Katwijk/Getty Images)
STOCKHOLM, SWEDEN - APRIL 30: Queen Silvia, Crown Princess Victoria of Sweden, Prince Daniel Princess Estelle, Prince Oscar and Princess Sofia attend the birthday celebrations of the King at the Royal Palace on April 30, 2017 in Stockholm, Sweden. (Photo by Patrick van Katwijk/Getty Images)
STOCKHOLM, SWEDEN - APRIL 30: Queen Silvia, Crown Princess Victoria of Sweden, Prince Daniel Princess Estelle, Prince Oscar and Princess Sofia attend the birthday celebrations of the King at the Royal Palace on April 30, 2017 in Stockholm, Sweden. (Photo by Patrick van Katwijk/Getty Images)
STOCKHOLM, SWEDEN - APRIL 30: Queen Silvia, Crown Princess Victoria of Sweden, Princess Estelle, Prince Oscar and Princess Sofia attend the birthday celebrations of the King at the Royal Palace on April 30, 2017 in Stockholm, Sweden. (Photo by Patrick van Katwijk/Getty Images)