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MADRID, SPAIN - JUNE 08: (SPANISH WEEKLY ENTERTAINMENT MAGAZINES OUT) Duke of Braganza Dom Duarte Pio and Duchess Isabel of Braganza attend the memorial service for Prince Kardam of Bulgaria at San Jeronimo el Real church on June 8, 2015 in Madrid, Spain. (Photo by Europa Press/Europa Press via Getty Images)

MADRID, SPAIN - JUNE 08: (SPANISH WEEKLY ENTERTAINMENT MAGAZINES OUT)   Duke of Braganza Dom Duarte Pio and Duchess Isabel of Braganza attend the memorial service for Prince Kardam of Bulgaria at San Jeronimo el Real church on June 8, 2015 in Madrid, Spain.  (Photo by Europa Press/Europa Press via Getty Images)

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LUXEMBOURG - OCTOBER 20: Princess Isabel Ines de Heredia, Duchess of Braganza (L) and Prince Dom Duarte, Duke of Braganza (R) attend the wedding ceremony of Prince Guillaume Of Luxembourg and Princess Stephanie of Luxembourg at the Cathedral of our Lady of Luxembourg on October 20, 2012 in Luxembourg, Luxembourg. The 30-year-old hereditary Grand Duke of Luxembourg is the last hereditary Prince in Europe to get married, marrying his 28-year old Belgian Countess bride in a lavish 2-day ceremony. (Photo by Pascal Le Segretain/Getty Images)

LUXEMBOURG - OCTOBER 20:  Princess Isabel Ines de Heredia, Duchess of Braganza (L) and Prince Dom Duarte, Duke of Braganza (R) attend the wedding ceremony of Prince Guillaume Of Luxembourg and Princess Stephanie of Luxembourg at the Cathedral of our Lady of Luxembourg on October 20, 2012 in Luxembourg, Luxembourg. The 30-year-old hereditary Grand Duke of Luxembourg is the last hereditary Prince in Europe to get married, marrying his 28-year old Belgian Countess bride in a lavish 2-day ceremony.  (Photo by Pascal Le Segretain/Getty Images)

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POTSDAM, GERMANY - AUGUST 27: Dom Duarte Pio, Duke of Braganza and wife Duchess Isabel of Braganza attend the religious wedding ceremony of Georg Friedrich Ferdinand Prince of Prussia to Princess Sophie of Prussia in the Friedenskirche Potsdam on August 27, 2011 in Potsdam, Germany. (Photo by Andreas Rentz/Getty Images)

POTSDAM, GERMANY - AUGUST 27:  Dom Duarte Pio, Duke of Braganza and wife Duchess Isabel of Braganza attend the religious wedding ceremony of Georg Friedrich Ferdinand Prince of Prussia to Princess Sophie of Prussia in the Friedenskirche Potsdam on August 27, 2011 in Potsdam, Germany.  (Photo by Andreas Rentz/Getty Images)

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SINTRA, PORTUGAL - MARCH 29: Duarte Pio, Duke of Braganza and his wife Isabel de Heredia, Duchess of Braganza visit Monserrate Palace on March 29, 2011 in Sintra, Portugal. (Photo by Alfredo Rocha/WireImage)

SINTRA, PORTUGAL - MARCH 29: Duarte Pio, Duke of Braganza and his wife Isabel de Heredia, Duchess of Braganza visit Monserrate Palace on March 29, 2011 in Sintra, Portugal.  (Photo by Alfredo Rocha/WireImage)