President of Finland Sauli Niinisto and his wife Jenni Haukio, President of Iceland Gudni Johannesson and his wife Eliza Reid, Princess Sofia, Princess Madeleine, Chris O'Neill, Prince Daniel, Queen Silvia, Queen Anne-Marie of Greece, Denmark's Queen Margrethe, Denmark's Crown Prince Frederik, Denmark's Crown Princess Mary, Crown Princess Victoria and Princess Estelle watch from the balcony during the changing of the guard in the outer courtyard of Stockholm Palace on the occasion of King Carl XVI Gustaf's 50th anniversary on the throne, in Stockholm, Sweden, September 15, 2023. REUTERS/Tom Little 

Britain's Princess Anne looks on from the spectator stands at the World Sheep Dog Trials in Dromore, Northern Ireland, September 13, 2023. REUTERS/Clodagh Kilcoyne 

Britain's Princess Anne looks on from the spectator stands at the World Sheep Dog Trials in Dromore, Northern Ireland, September 13, 2023. REUTERS/Clodagh Kilcoyne 

Britain's Princess Anne looks on from the spectator stands at the World Sheep Dog Trials in Dromore, Northern Ireland, September 13, 2023. REUTERS/Clodagh Kilcoyne 

Britain's Princess Anne looks on from the spectator stands at the World Sheep Dog Trials in Dromore, Northern Ireland, September 13, 2023. REUTERS/Clodagh Kilcoyne 

Mike Tindall, Princess Anne, Princess Royal, Prince William, Prince of Wales and Catherine, Princess of Wales attend the recording of a special episode of The Good, The Bad and The Rugby podcast, in the Green Drawing Room at Windsor Castle, in Windsor, England, September 6, 2023. Chris Jackson/Pool via REUTERS 

Mike Tindall, Princess Anne, Princess Royal, Prince William, Prince of Wales and Catherine, Princess of Wales attend the recording of a special episode of The Good, The Bad and The Rugby podcast, in the Green Drawing Room at Windsor Castle, in Windsor, England, September 6, 2023. Chris Jackson/Pool via REUTERS 

Britain's Princess Anne, Princess Royal and Prince William, Prince of Wales attend the recording of a special episode of The Good, The Bad and The Rugby podcast, in the Green Drawing Room at Windsor Castle, in Windsor, England, September 6, 2023. Chris Jackson/Pool via REUTERS 

Mike Tindall, Princess Anne, Princess Royal, Prince William, Prince of Wales and Catherine, Princess of Wales attend the recording of a special episode of The Good, The Bad and The Rugby podcast, in the Green Drawing Room at Windsor Castle, in Windsor, England, September 6, 2023. Chris Jackson/Pool via REUTERS 

Britain's Anne, the Princess Royal attends the recording of a special episode of The Good, The Bad and The Rugby podcast, in the Green Drawing Room at Windsor Castle, in Windsor, England, September 6, 2023. Chris Jackson/Pool via REUTERS 

Britain's Anne, the Princess Royal, attends a service at Crathie Church, Balmoral, Scotland, Britain September 3, 2023. Arthur Edwards/Pool via REUTERS 

Britain's King Charles, Queen Camilla and Anne, the Princess Royal, attend a service at Crathie Church, Balmoral, Scotland, Britain September 3, 2023. Arthur Edwards/Pool via REUTERS 

Britain's King Charles, Queen Camilla and Anne, the Princess Royal attend the Braemar Royal Highland Gathering at the Princess Royal and Duke of Fife Memorial Park in Braemar, Scotland, Britain September 2, 2023. REUTERS/Russell Cheyne 

Britain's King Charles, Queen Camilla and Anne, the Princess Royal attend the Braemar Royal Highland Gathering at the Princess Royal and Duke of Fife Memorial Park in Braemar, Scotland, Britain September 2, 2023. REUTERS/Russell Cheyne 

Britain's King Charles, Queen Camilla and Anne, the Princess Royal attend the Braemar Royal Highland Gathering at the Princess Royal and Duke of Fife Memorial Park in Braemar, Scotland, Britain September 2, 2023. REUTERS/Russell Cheyne 

Britain's Anne, the Princess Royal looks out of a car window at the Braemar Royal Highland Gathering at the Princess Royal and Duke of Fife Memorial Park in Braemar, Scotland, Britain September 2, 2023. REUTERS/Russell Cheyne 

Britain's Anne, the Princess Royal looks out of a car window at the Braemar Royal Highland Gathering at the Princess Royal and Duke of Fife Memorial Park in Braemar, Scotland, Britain September 2, 2023. REUTERS/Russell Cheyne 

Britain's King Charles, Queen Camilla and Anne, the Princess Royal attend the Braemar Royal Highland Gathering at the Princess Royal and Duke of Fife Memorial Park in Braemar, Scotland, Britain September 2, 2023. REUTERS/Russell Cheyne 

Britain's King Charles, Queen Camilla and Anne, the Princess Royal attend the Braemar Royal Highland Gathering at the Princess Royal and Duke of Fife Memorial Park in Braemar, Scotland, Britain September 2, 2023. REUTERS/Russell Cheyne 

Britain's King Charles, Queen Camilla and Anne, the Princess Royal attend the Braemar Royal Highland Gathering at the Princess Royal and Duke of Fife Memorial Park in Braemar, Scotland, Britain September 2, 2023. REUTERS/Russell Cheyne 

Britain's King Charles, Queen Camilla and Anne, the Princess Royal attend the Braemar Royal Highland Gathering at the Princess Royal and Duke of Fife Memorial Park in Braemar, Scotland, Britain September 2, 2023. REUTERS/Russell Cheyne 

Britain's Anne, Princess Royal attends the Braemar Royal Highland Gathering at the Princess Royal and Duke of Fife Memorial Park in Braemar, Scotland, Britain September 2, 2023. REUTERS/Russell Cheyne 

Britain's King Charles, Queen Camilla and Anne, the Princess Royal attend the Braemar Royal Highland Gathering at the Princess Royal and Duke of Fife Memorial Park in Braemar, Scotland, Britain September 2, 2023. REUTERS/Russell Cheyne 

Britain's King Charles, Queen Camilla and Anne, the Princess Royal attend the Braemar Royal Highland Gathering at the Princess Royal and Duke of Fife Memorial Park in Braemar, Scotland, Britain September 2, 2023. REUTERS/Russell Cheyne 

Britain's Anne, The Princess Royal at the Palace of Holyroodhouse, Edinburgh, following the National Service of Thanksgiving and Dedication for King Charles and Queen Camilla, and the presentation of the Honours of Scotland. Picture date: Wednesday July 5, 2023. Lesley Martin/Pool via REUTERS 

Britain's Anne, The Princess Royal at the Palace of Holyroodhouse, Edinburgh, following the National Service of Thanksgiving and Dedication for King Charles and Queen Camilla, and the presentation of the Honours of Scotland. Picture date: Wednesday July 5, 2023. Lesley Martin/Pool via REUTERS 

Britain's Anne, the Princess Royal ahead of the fly past by the Red Arrows outside the Palace of Holyroodhouse, Edinburgh, for the National Service of Thanksgiving and Dedication for King Charles III and Queen Camilla, and the presentation of the Honours of Scotland. Picture date: Wednesday July 5, 2023. John Linton/Pool via REUTERS 

Britain's Anne, the Princess Royal ahead of the fly past by the Red Arrows outside the Palace of Holyroodhouse, Edinburgh, for the National Service of Thanksgiving and Dedication for King Charles III and Queen Camilla, and the presentation of the Honours of Scotland. Picture date: Wednesday July 5, 2023. John Linton/Pool via REUTERS 

Britain's Anne, The Princess Royal ahead of the fly past by the Red Arrows outside the Palace of Holyroodhouse, Edinburgh, for the National Service of Thanksgiving and Dedication for King Charles III and Queen Camilla, and the presentation of the Honours of Scotland. Picture date: Wednesday July 5, 2023. John Linton/Pool via REUTERS 

Horse Racing - Royal Ascot - Ascot Racecourse, Ascot, Britain - June 21, 2023 Britain's Princess Anne, the Princess Royal and Zara Tindall are pictured ahead of the day's races REUTERS/Andrew Boyers 

Horse Racing - Royal Ascot - Ascot Racecourse, Ascot, Britain - June 20, 2023 Ryan Moore looks at the trophy before it being presented it by Britain's Princess Anne, the Princess Royalafter after winning the 16:20 St James's Palace Stakes riding Paddington REUTERS/John Sibley 

Horse Racing - Royal Ascot - Ascot Racecourse, Ascot, Britain - June 20, 2023 Britain's Princess Anne, the Princess Royal is pictured holding the winners trophy for the 16:20 St James's Palace Stakes before the winner presentation REUTERS/John Sibley 

Horse Racing - Royal Ascot - Ascot Racecourse, Ascot, Britain - June 20, 2023 Britain's Princess Anne, the Princess Royal is pictured during the Royal procession REUTERS/Toby Melville 

Horse Racing - Royal Ascot - Ascot Racecourse, Ascot, Britain - June 20, 2023 Britain's Princess Anne, the Princess Royal is pictured during the Royal procession REUTERS/Toby Melville 

Horse Racing - Royal Ascot - Ascot Racecourse, Ascot, Britain - June 20, 2023 Britain's Princess Anne, the Princess Royal is pictured during the Royal procession REUTERS/Andrew Boyers 

Princess Anne, Princess Royal departs the Order Of The Garter Service at Windsor Castle on June 19, 2023 in Windsor, England. Chris Jackson/Pool via REUTERS 

Britain's Prince Edward, Duke of Edinburgh, Britain's Sophie, Duchess of Edinburgh, Vice Admiral Timothy Laurence and Britain's Princess Anne, Princess Royal leave in a horse-drawn carriage from St George's Chapel after attending the Most Noble Order of the Garter Ceremony in Windsor Castle in Windsor, Britain on June 19, 2023. Henry Nicholls/Pool via REUTERS 

Britain's Princess Anne, Princess Royal leaves in a horse-drawn carriage from St George's Chapel after attending the Most Noble Order of the Garter Ceremony in Windsor Castle in Windsor, Britain June 19, 2023. Henry Nicholls/Pool via REUTERS 

Britain's Princess Anne, Princess Royal and the Britain's Prince William, Prince of Wales attend the annual Order of the Garter Service at St George's Chapel, Windsor Castle, Britain. Picture date: Monday June 19, 2023. Yui Mok/Pool via REUTERS 

(From L) Britain's Princess Anne, Princess Royal, Britain's Prince Edward, Duke of Edinburgh and Britain's Prince William, Prince of Wales arrive at St George's Chapel to attend the Most Noble Order of the Garter Ceremony in Windsor Castle in Windsor, on June 19, 2023. The Order of the Garter is the oldest and most senior Order of Chivalry in Britain, established by King Edward III nearly 700 years ago. HENRY NICHOLLS/Pool via REUTERS 

Britain's King Charles, Queen Camilla, Prince William, Catherine, Princess of Wales, Prince George, Princess Charlotte, Prince Louis, Prince Edward, Duke of Edinburgh and Sophie, Duchess of Edinburgh, Anne, Princess Royal, Sir Timothy Laurence, Prince Edward, Duke of Kent, Birgitte, Duchess of Gloucester and Prince Richard, Duke of Gloucester appear on the balcony of Buckingham Palace as part of Trooping the Colour parade to honour Britain's King Charles on his official birthday in London, Britain, June 17, 2023. REUTERS/Toby Melville 

Britain's King Charles, Prince Edward, Duke of Edinburgh and Anne, Princess Royal ride on horseback as part of Trooping the Colour parade which honours King Charles on his official birthday, in London, Britain, June 17, 2023. REUTERS/Toby Melville 

Britain's King Charles, Queen Camilla, Prince William, Catherine, Princess of Wales, Prince George, Princess Charlotte, Prince Louis and Anne, Princess Royal appear on the balcony of Buckingham Palace as part of Trooping the Colour parade to honour Britain's King Charles on his official birthday in London, Britain, June 17, 2023. REUTERS/Toby Melville 

Britain's King Charles, Queen Camilla, Prince William, Catherine, Princess of Wales, Prince George, Princess Charlotte, Prince Louis, Prince Edward, Duke of Edinburgh and Sophie, Duchess of Edinburgh, and Anne, Princess Royal appear on the balcony of Buckingham Palace as part of Trooping the Colour parade to honour Britain's King Charles on his official birthday in London, Britain, June 17, 2023. REUTERS/Toby Melville 

Britain's King Charles, Queen Camilla, Prince William, Catherine, Princess of Wales, Prince George, Princess Charlotte, Prince Louis, Prince Edward, Duke of Edinburgh and Sophie, Duchess of Edinburgh, Anne, Princess Royal and Sir Timothy Laurence appear on the balcony of Buckingham Palace as part of Trooping the Colour parade to honour Britain's King Charles on his official birthday in London, Britain, June 17, 2023. REUTERS/Toby Melville 

Britain's King Charles,Queen Camilla, Prince William, Catherine, Princess of Wales, Prince George, Princess Charlotte, Prince Louis and Anne, Princess Royal appear on the balcony of Buckingham Palace as part of Trooping the Colour parade to honour Britain's King Charles on his official birthday in London, Britain, June 17, 2023. REUTERS/Toby Melville 

Britain's King Charles, Prince William, Prince Edward, Duke of Edinburgh and Anne, Princess Royal ride on horseback as part of Trooping the Colour parade which honours King Charles on his official birthday, in London, Britain, June 17, 2023. REUTERS/Toby Melville TPX IMAGES OF THE DAY 

Britain's King Charles, Prince William, Prince Edward, Duke of Edinburgh and Anne, Princess Royal ride on horseback as part of Trooping the Colour parade which honours King Charles on his official birthday, in London, Britain, June 17, 2023. REUTERS/Toby Melville 

Britain's King Charles, Prince William, Prince Edward, Duke of Edinburgh and Anne, Princess Royal ride on horseback as part of Trooping the Colour parade which honours King Charles on his official birthday, in London, Britain, June 17, 2023. REUTERS/Toby Melville 

Britain's King Charles, Prince William, Prince Edward, Duke of Edinburgh and Anne, Princess Royal ride on horseback as part of Trooping the Colour parade which honours King Charles on his official birthday, in London, Britain, June 17, 2023. REUTERS/Toby Melville 

Anne, the Princess Royal, speaks to guests during a ceremony at Buckingham Palace, London, to present the new Sovereign's Standard to the Blues and Royals (Royal Horse Guards and 1st Dragoons). Picture date: Thursday June 15, 2023. Victoria Jones/Pool via REUTERS 

Anne, the Princess Royal watches as Britain's King Charles is offered the new Sovereign's Standard during a ceremony to present the new Sovereign's Standard to the Blues and Royals (Royal Horse Guards and 1st Dragoons) at Buckingham Palace, London, Britain. Picture date: Thursday June 15, 2023. Victoria Jones/Pool via REUTERS 

Anne, the Princess Royal watches as Britain's King Charles is offered the new Sovereign's Standard during a ceremony to present the new Sovereign's Standard to the Blues and Royals (Royal Horse Guards and 1st Dragoons) at Buckingham Palace, London, Britain. Picture date: Thursday June 15, 2023. Victoria Jones/Pool via REUTERS 

Anne, the Princess Royal, speaks to guests after King Charles III presented the new Sovereign's Standard to The Blues and Royals during a ceremony at Buckingham Palace, London. Picture date: Thursday June 15, 2023. Yui Mok/Pool via REUTERS 

Anne, the Princess Royal, speaks to guests after King Charles III presented the new Sovereign's Standard to The Blues and Royals during a ceremony at Buckingham Palace, London. Picture date: Thursday June 15, 2023. Yui Mok/Pool via REUTERS 

Anne, the Princess Royal, speaks to guests after King Charles III presented the new Sovereign's Standard to The Blues and Royals during a ceremony at Buckingham Palace, London. Picture date: Thursday June 15, 2023. Yui Mok/Pool via REUTERS 

King Charles III salutes, alongside Anne, the Princess Royal, during a ceremony at Buckingham Palace, London, to present the new Sovereign's Standard to the Blues and Royals (Royal Horse Guards and 1st Dragoons). Picture date: Thursday June 15, 2023. Victoria Jones/Pool via REUTERS 

King Charles III salutes, alongside Anne, the Princess Royal, during a ceremony at Buckingham Palace, London, to present the new Sovereign's Standard to the Blues and Royals (Royal Horse Guards and 1st Dragoons). Picture date: Thursday June 15, 2023. Victoria Jones/Pool via REUTERS 

King Charles III salutes, alongside Anne, the Princess Royal, during a ceremony at Buckingham Palace, London, to present the new Sovereign's Standard to the Blues and Royals (Royal Horse Guards and 1st Dragoons). Picture date: Thursday June 15, 2023. Victoria Jones/Pool via REUTERS 

King Charles III salutes, alongside Anne, the Princess Royal, during a ceremony at Buckingham Palace, London, to present the new Sovereign's Standard to the Blues and Royals (Royal Horse Guards and 1st Dragoons). Picture date: Thursday June 15, 2023. Victoria Jones/Pool via REUTERS