Belgian King Albert, Queen Paola, Prince Laurent, Princess Claire, Princess Astrid and Prince Lorenz, together with Prime Minister Alexander De Croo and Belgian lawmakers, attend a ceremony in honour of King's Day at the Belgian Parliament in Brussels, Belgium November 15, 2022. REUTERS/Yves Herman 

Belgian King Albert, Queen Paola, Prince Laurent, Princess Claire, Princess Astrid and Prince Lorenz pose for pictures with Prime Minister Alexander De Croo and members of Belgian government, during a ceremony at Belgian Parliament in honour of King's Day in Brussels, Belgium November 15, 2022. REUTERS/Yves Herman 

Belgian Princess Astrid and Prince Lorenz leave after attending a 'Te Deum' Mass in honour of King's Day at St Michael and St Gudula Cathedral in Brussels, Belgium November 15, 2022. REUTERS/Yves Herman 

Belgian King Albert, Queen Paola, Prince Laurent, Princess Claire, Princess Astrid and Prince Lorenz attend a 'Te Deum' Mass in honour of King's Day at St Michael and St Gudula Cathedral in Brussels, Belgium November 15, 2022. REUTERS/Yves Herman 

Belgian King Albert, Queen Paola, Prince Laurent, Princess Claire, Princess Astrid and Prince Lorenz attend a 'Te Deum' Mass in honour of King's Day at St Michael and St Gudula Cathedral in Brussels, Belgium November 15, 2022. REUTERS/Yves Herman 

Princess Maria Laura of Belgium and Prince Lorenz of Belgium arrive at the religious wedding service of Princess Maria Laura of Belgium and William Isvy at the Cathedral of St. Michael and St. Gudula in Brussels, Belgium, September 10, 2022. REUTERS/Johanna Geron 

Princess Maria Laura of Belgium and Prince Lorenz arrive at the religious wedding service of Princess Maria Laura of Belgium and William Isvy at the Cathedral of St. Michael and St. Gudula in Brussels, Belgium, September 10, 2022. REUTERS/Johanna Geron 

Princess Maria Laura of Belgium and Prince Lorenz arrive at the religious wedding service of Princess Maria Laura of Belgium and William Isvy at the Cathedral of St. Michael and St. Gudula in Brussels, Belgium, September 10, 2022. REUTERS/Johanna Geron 

Princess Maria Laura of Belgium and Prince Lorenz arrive at the religious wedding service of Princess Maria Laura of Belgium and William Isvy at the Cathedral of St. Michael and St. Gudula in Brussels, Belgium, September 10, 2022. REUTERS/Johanna Geron 

Belgium's Princess Delphine, her husband James O'Hare, Princess Claire, Prince Laurent and Prince Lorenz attend Belgian national day celebrations in Brussels, Belgium July 21, 2022. REUTERS/Yves Herman 

Belgium's Princess Delphine, her husband James O'Hare, Belgium's Prince Laurent, Belgium's Prince Lorenz and Belgium's Princess Astrid attend a parade on Belgian national day in Brussels, Belgium July 21, 2021. REUTERS/Yves Herman 

Belgium's Princess Delphine, her husband James O'Hare, Belgium's Prince Laurent, Belgium's Prince Lorenz and Belgium's Princess Astrid attend a parade on Belgian national day in Brussels, Belgium July 21, 2021. REUTERS/Yves Herman 

Belgium's Prince Lorenz, Princess Astrid and Prince Laurent attend a celebration on the occasion of Belgian national day, in Brussels, Belgium, July 21, 2020. REUTERS/Francois Lenoir 

Belgium's King Philippe, Queen Mathilde, King Albert, Queen Paola, Princess Claire, Princess Astrid, Prince Lorenz and their children pose in front of a Christmas tree before a traditional Christmas concert at the Brussels Royal Palace, Belgium December 19, 2019. REUTERS/Johanna Geron 

Belgium's King Philippe, Queen Mathilde, King Albert, Queen Paola, Princess Claire, Princess Astrid, Prince Lorenz and their children pose in front of a Christmas tree before a traditional Christmas concert at the Brussels Royal Palace, Belgium December 19, 2019. REUTERS/Johanna Geron 

Belgium's Prince Lorenz and Princess Astrid leave after attending the funeral ceremony of Luxembourg's Grand Duke Jean at the Notre-Dame Cathedral in Luxembourg, May 4, 2019. REUTERS/Francois Lenoir 

Belgium's King Philippe, Queen Mathilde, Princess Claire, Princess Astrid, Prince Lorenz and their children pose in front of a Christmas tree before a traditional Christmas concert at the Brussels Royal Palace, Belgium December 20, 2017. REUTERS/Francois Lenoir 

Belgium's King Philippe, Queen Mathilde, Princess Claire, Princess Astrid, Prince Lorenz and their children pose in front of a Christmas tree before a traditional Christmas concert at the Brussels Royal Palace, Belgium December 20, 2017. REUTERS/Francois Lenoir 

Belgium's Princess Astrid and her husband, Prince Lorenz, Greece's Queen Anne Marie, Britain's Prince Charles, Former Spanish Queen Sofia and former Spanish King Juan Carlos, King Carl Gustaf of Sweden (unseen) and his wife, Sweden's Queen Silvia and Henri, Duke of Luxembourg, (unseen), Crown Princess Margareta of Romania and her husband, Radu Duda, attend a funeral ceremony for late Romanian King Michael in Bucharest, Romania, December 16, 2017. REUTERS/Stoyan Nenov 

Belgium's Princess Astrid and her husband, Prince Lorenz, attend a funeral ceremony for late Romanian King Michael in Bucharest, Romania, December 16, 2017. REUTERS/Stoyan Nenov 

Belgium's Prince Lorenz, Princess Astrid, Princess Claire and Prince Laurent attend the traditional military parade in front of the Royal Palace on Belgian national day in Brussels, Belgium July 21, 2017. REUTERS/Yves Herman 

Belgium's Princess Astrid and Prince Lorenz visit the European Motor Show in Brussels, Belgium, January 13, 2017. REUTERS/Francois Lenoir 

Belgium's Princess Astrid and Prince Lorenz visit the European Motor Show in Brussels, Belgium, January 13, 2017. REUTERS/Francois Lenoir 

Belgium's King Philippe, Queen Mathilde and their children (L-R) Prince Gabriel, Prince Emmanuel, Princess Eleonore and Crown Princess Elisabeth pose with Princess Astrid and Prince Lorenz in front of a Christmas tree before a traditional Christmas concert at the Brussels Royal Palace, Belgium December 21, 2016. REUTERS/Francois Lenoir TPX IMAGES OF THE DAY 

Belgium's Prince Lorenz and Princess Astrid attend the traditional military parade in front of the Royal Palace in Brussels July 21, 2015. Belgium celebrates its National Day on Tuesday. REUTERS/Francois Lenoir

Belgium's Princess Astrid and Prince Lorenz mourn next to the coffin of Belgium's Queen Fabiola at the Brussels Royal Palace December 9, 2014. Belgium's Queen Fabiola, widow of King Baudouin and queen between 1960 and 1993, died last Friday at the age of 86, the royal palace said. REUTERS/Olivier Hoslet/Pool (BELGIUM - Tags: OBITUARY ROYALS) 

Belgium's Princess Astrid and Prince Lorenz mourn next to the coffin of Belgium's Queen Fabiola at the Brussels Royal Palace December 9, 2014. Belgium's Queen Fabiola, widow of King Baudouin and queen between 1960 and 1993, died last Friday at the age of 86, the royal palace said. REUTERS/Didier Lebrun/Pool (BELGIUM - Tags: OBITUARY ROYALS) 

Belgium's Prince Lorenz and Princess Astrid arrive at a Te Deum mass given on the occasion of King's Day at Saint-Gudule cathedral in Brussels November 15, 2014. REUTERS/Eric Vidal (BELGIUM - Tags: ENTERTAINMENT RELIGION ROYALS) 

Belgium's Prince Lorenz, Princess Astrid, Queen Paola and Princess Claire (front row, L-R) attend a Te Deum mass on the occasion of King's Day at Saint-Gudule cathedral in Brussels November 15, 2014. REUTERS/Eric Vidal (BELGIUM - Tags: ENTERTAINMENT RELIGION ROYALS) 

Belgium's Prince Lorenz, Princess Astrid, Queen Paola and Princess Claire (front row, L-R) attend a Te Deum mass on the occasion of King's Day at Saint-Gudule cathedral in Brussels November 15, 2014. REUTERS/Eric Vidal (BELGIUM - Tags: ENTERTAINMENT RELIGION ROYALS) 

Belgium's royal family (L-R) Prince Lorenz, Princess Astrid, Queen Paola and Princess Claire attend a Te Deum mass on the occasion of King's Day at the Saint-Gudule cathedral in Brussels November 15, 2014. REUTERS/Eric Vidal (BELGIUM - Tags: ENTERTAINMENT RELIGION ROYALS) 

Belgium's royal family (1st row L-R) Prince Lorenz, Princess Astrid, Queen Paola and Princess Claire attend a Te Deum mass on the occasion of King's Day at the Saint-Gudule cathedral in Brussels November 15, 2014. REUTERS/Eric Vidal (BELGIUM - Tags: ENTERTAINMENT RELIGION ROYALS) 

Belgium's royal family (1st row L-R) Prince Lorenz, Princess Astrid, Queen Paola and Princess Claire attend a Te Deum mass on the occasion of King's Day at the Saint-Gudule cathedral in Brussels November 15, 2014. REUTERS/Eric Vidal (BELGIUM - Tags: ENTERTAINMENT RELIGION ROYALS) 

Belgian Prince Amedeo (second row 2ndL) and his fiancee Elisabetta Rosboch von Wolkenstein (2nd row C) pose for a photograph with members of their family, including Belgian King Philippe (second row 3rd R) and Queen Mathilde (second row 2nd R) during an engagement ceremony at Schonenberg residency in Brussels February 16, 2014. Prince Amadeo, son of Belgian Princess Astrid and Prince Lorenz, is to marry his girlfriend, Italian Elisabetta Rosboch von Wolkenstein, later this year. REUTERS/Frederic Sierakowski/Pool (BELGIUM - Tags: ROYALS)

Belgian Prince Amedeo (2ndL) and his fiancee Elisabetta Rosboch von Wolkenstein (C) pose for a photograph with members of their family during an engagement ceremony at Schonenberg residency in Brussels February 16, 2014. Prince Amadeo, son of Belgian Princess Astrid and Prince Lorenz, is to marry his girlfriend, Italian Elisabetta Rosboch von Wolkenstein, later this year. REUTERS/Frederic Sierakowski/Pool (BELGIUM - Tags: ROYALS)

Belgian Prince Amedeo (L) and his fiancee Elisabetta Rosboch von Wolkenstein pose for a photograph during an engagement ceremony at Schonenberg residency in Brussels February 16, 2014. Prince Amadeo, son of Belgian Princess Astrid and Prince Lorenz, is to marry his girlfriend, Italian Elisabetta Rosboch von Wolkenstein, later this year. REUTERS/Frederic Sierakowski/Pool (BELGIUM - Tags: ROYALS)

Belgian Prince Amedeo (3rdL) and his fiancee Elisabetta Rosboch von Wolkenstein (3rdR) pose for a photograph with their parents Prince Lorenz (L), Princess Astrid (2ndL), countess Lilia de Smecchia (2ndR) and Ettore Rosboch von Wolkenstein (R) during an engagement ceremony at Schonenberg residency in Brussels February 16, 2014. Prince Amadeo, son of Belgian Princess Astrid and Prince Lorenz, is to marry his girlfriend, Italian Elisabetta Rosboch von Wolkenstein, later this year. REUTERS/Frederic Sierakowski/Pool (BELGIUM - Tags: ROYALS)

Belgian Prince Amedeo (4thL) and his fiancee Elisabetta Rosboch von Wolkenstein (second row 5th R) pose for a photograph with members of their family during an engagement ceremony at Schonenberg residency in Brussels February 16, 2014. Prince Amadeo, son of Belgian Princess Astrid and Prince Lorenz, is to marry his girlfriend, Italian Elisabetta Rosboch von Wolkenstein, later this year. REUTERS/Frederic Sierakowski/Pool (BELGIUM - Tags: ROYALS)

Belgian Prince Amedeo (L) and his fiancee Elisabetta Rosboch von Wolkenstein pose for a photograph during an engagement ceremony at Schonenberg residency in Brussels February 16, 2014. Prince Amadeo, son of Belgian Princess Astrid and Prince Lorenz, is to marry his girlfriend, Italian Elisabetta Rosboch von Wolkenstein, later this year. REUTERS/Frederic Sierakowski/Pool (BELGIUM - Tags: ROYALS)

Belgian Prince Amedeo (L) and his fiancee Elisabetta Rosboch von Wolkenstein pose for a photograph during an engagement ceremony at Schonenberg residency in Brussels February 16, 2014. Prince Amadeo, son of Belgian Princess Astrid and Prince Lorenz, is to marry his girlfriend, Italian Elisabetta Rosboch von Wolkenstein, later this year. REUTERS/Frederic Sierakowski/Pool (BELGIUM - Tags: ROYALS)

Belgian Prince Amedeo (L) walks with his fiancee Elisabetta Rosboch von Wolkenstein pose for a photograph during an engagement ceremony at Schonenberg residency in Brussels February 16, 2014. Prince Amadeo, son of Belgian Princess Astrid and Prince Lorenz, is to marry his girlfriend, Italian Elisabetta Rosboch von Wolkenstein, later this year. REUTERS/Frederic Sierakowski/Pool (BELGIUM - Tags: ROYALS)

Belgian Prince Amedeo (L) walks with his fiancee Elisabetta Rosboch von Wolkenstein pose for a photograph during an engagement ceremony at Schonenberg residency in Brussels February 16, 2014. Prince Amadeo, son of Belgian Princess Astrid and Prince Lorenz, is to marry his girlfriend, Italian Elisabetta Rosboch von Wolkenstein, later this year. REUTERS/Frederic Sierakowski/Pool (BELGIUM - Tags: ROYALS)

Belgian Prince Amedeo (L) and his fiancee Elisabetta Rosboch von Wolkenstein pose for a photograph during an engagement ceremony at Schonenberg residency in Brussels February 16, 2014. Prince Amadeo, son of Belgian Princess Astrid and Prince Lorenz, is to marry his girlfriend, Italian Elisabetta Rosboch von Wolkenstein, later this year. REUTERS/Frederic Sierakowski/Pool (BELGIUM - Tags: ROYALS)

Belgian Prince Amedeo (C) poses for a photograph with his mother Princess Astrid (L) and his fiancee Elisabetta Rosboch von Wolkenstein (R) during an engagement ceremony at Schonenberg residency in Brussels February 16, 2014. Prince Amadeo, son of Belgian Princess Astrid and Prince Lorenz, is to marry his girlfriend, Italian Elisabetta Rosboch von Wolkenstein, later this year. REUTERS/Frederic Sierakowski/Pool (BELGIUM - Tags: ROYALS)

Belgian Prince Amedeo (C) poses for a photograph with his mother Princess Astrid (L) and his fiancee Elisabetta Rosboch von Wolkenstein (R) during an engagement ceremony at Schonenberg residency in Brussels February 16, 2014. Prince Amadeo, son of Belgian Princess Astrid and Prince Lorenz, is to marry his girlfriend, Italian Elisabetta Rosboch von Wolkenstein, later this year. REUTERS/Frederic Sierakowski/Pool (BELGIUM - Tags: ROYALS)

Belgian Prince Amedeo (L) and his fiancee Elisabetta Rosboch von Wolkenstein pose for a photograph during an engagement ceremony at Schonenberg residency in Brussels February 16, 2014. Prince Amadeo, son of Belgian Princess Astrid and Prince Lorenz, is to marry his girlfriend, Italian Elisabetta Rosboch von Wolkenstein, later this year. REUTERS/Frederic Sierakowski/Pool (BELGIUM - Tags: ROYALS)

Belgian Prince Amedeo (L) and his fiancee Elisabetta Rosboch von Wolkenstein pose for a photograph during an engagement ceremony at Schonenberg residency in Brussels February 16, 2014. Prince Amadeo, son of Belgian Princess Astrid and Prince Lorenz, is to marry his girlfriend, Italian Elisabetta Rosboch von Wolkenstein, later this year. REUTERS/Frederic Sierakowski/Pool (BELGIUM - Tags: ROYALS)

Belgian Prince Amedeo (second row 5thL) and his fiancee Elisabetta Rosboch von Wolkenstein (second row 6th R) pose for a photograph with members of their family during an engagement ceremony at Schonenberg residency in Brussels February 16, 2014. Prince Amadeo, son of Belgian Princess Astrid and Prince Lorenz, is to marry his girlfriend, Italian Elisabetta Rosboch von Wolkenstein, later this year. REUTERS/Frederic Sierakowski/Pool (BELGIUM - Tags: ROYALS)

Belgian Prince Amedeo (L) and his fiancee Elisabetta Rosboch von Wolkenstein pose for a photograph during an engagement ceremony at Schonenberg residency in Brussels February 16, 2014. Prince Amadeo, son of Belgian Princess Astrid and Prince Lorenz, is to marry his girlfriend, Italian Elisabetta Rosboch von Wolkenstein, later this year. REUTERS/Frederic Sierakowski/Pool (BELGIUM - Tags: ROYALS)

Belgian Prince Amedeo (L) and his fiancee Elisabetta Rosboch von Wolkenstein pose for a photograph during an engagement ceremony at Schonenberg residency in Brussels February 16, 2014. Prince Amadeo, son of Belgian Princess Astrid and Prince Lorenz, is to marry his girlfriend, Italian Elisabetta Rosboch von Wolkenstein, later this year. REUTERS/Frederic Sierakowski/Pool (BELGIUM - Tags: ROYALS)

Belgian Prince Amedeo (L) and his fiancee Elisabetta Rosboch von Wolkenstein pose for a photograph during an engagement ceremony at Schonenberg residency in Brussels February 16, 2014. Prince Amadeo, son of Belgian Princess Astrid and Prince Lorenz, is to marry his girlfriend, Italian Elisabetta Rosboch von Wolkenstein, later this year. REUTERS/Frederic Sierakowski/Pool (BELGIUM - Tags: ROYALS)

Belgian Prince Amedeo (L) and his fiancee Elisabetta Rosboch von Wolkenstein pose for a photograph during an engagement ceremony at Schonenberg residency in Brussels February 16, 2014. Prince Amadeo, son of Belgian Princess Astrid and Prince Lorenz, is to marry his girlfriend, Italian Elisabetta Rosboch von Wolkenstein, later this year. REUTERS/Frederic Sierakowski/Pool (BELGIUM - Tags: ROYALS)

(L-R) Belgium's Prince Laurent, Queen Mathilde, King Philippe, Princess Astrid and Prince Lorenz attend a traditional new year reception for international institutions' representatives, government members and business leaders at the Brussels Royal Palace January 29, 2014. REUTERS/Francois Lenoir (BELGIUM - Tags: ROYALS POLITICS) 

(L-R) Prince Albert II of Monaco, Belgium's Princess Astrid and Prince Lorenz attend a presentation at the European Organisation for Research and Treatment of Cancer (EORTC) in Brussels January 24, 2014. REUTERS/Francois Lenoir (BELGIUM - Tags: ROYALS SCIENCE TECHNOLOGY HEALTH) 

(From L to R) Prince Albert II of Monaco is welcomed by Belgium's Princess Astrid and Prince Lorenz as they arrive at the headquarters of the European Organisation for Research and Treatment of Cancer (EORTC) in Brussels January 24, 2014. REUTERS/Francois Lenoir (BELGIUM - Tags: ROYALS HEALTH) 

Belgium's Princess Astrid and Prince Lorenz attend a presentation at the European Organisation for Research and Treatment of Cancer (EORTC) in Brussels January 24, 2014. REUTERS/Francois Lenoir (BELGIUM - Tags: ROYALS HEALTH) 

(From L to R) Director General of the European Organisation for Research and Treatment of Cancer (EORTC) Francoise Meunier, Sir Christopher Mallaby of Britain, Prince Albert II of Monaco, Belgium's Princess Astrid and Prince Lorenz pose at the EORTC headquarters in Brussels January 24, 2014. REUTERS/Francois Lenoir (BELGIUM - Tags: ROYALS HEALTH) 

(From L to R) Prince Albert II of Monaco, Belgium's Princess Astrid and Prince Lorenz arrive at the headquarters of the European Organisation for Research and Treatment of Cancer (EORTC) in Brussels January 24, 2014. REUTERS/Francois Lenoir (BELGIUM - Tags: ROYALS HEALTH) 

(L-R) Belgium's Prince Lorenz, Queen Mathilde, Princess Claire, King Philippe, Prince Laurent, Queen Fabiola, King Albert and Queen Paola attend a mass commemorating the 20th anniversary of King Baudouin's death at Saint Gudule cathedral in Brussels July 31, 2013. REUTERS/Yves Herman (BELGIUM - Tags: ENTERTAINMENT OBITUARY ROYALS ANNIVERSARY) 

(Left balcony, L to R) Belgium's Princess Claire, Prince Laurent, Princess Astrid, and Prince Lorenz join (Right balcony, L-R) Queen Fabiola, Queen Mathilde, King Philippe, King Albert II and Queen Paola together with the young royal princes and princesses on the balcony of the Royal Palace in Brussels July 21, 2013. Belgium is celebrating its National Day, which also marks the abdication of King Albert II of Belgium and the investiture of his eldest son Philippe. REUTERS/Yves Herman (BELGIUM - Tags: ROYALS ENTERTAINMENT) (KING-BELGIUM)