STOCKHOLM, SWEDEN - APRIL 30: King Carl XVI Gustaf of Sweden, Queen Silvia, Crown Princess Victoria of Sweden and Princess Estelle 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: King Carl XVI Gustaf of Sweden, Queen Silvia, Crown Princess Victoria of Sweden and Princess Estelle 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: King Carl XVI Gustaf of Sweden, Queen Silvia, Crown Princess Victoria of Sweden and Princess Estelle 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: Crown Princess Victoria of Sweden holding Prince Oscar of Sweden, Queen Silvia of Sweden and  Prince Daniel of Sweden holding Princess Estelle of Sweden watch the celebrations of King Carl Gustav's 71st birthday from a balcony at the Royal Palace on April 30, 2017 in Stockholm, Sweden. (Photo by Michael Campanella/Getty Images)