Princess Kate returns at Trooping the Colour amid cancer treatment

(L-R) Britain's Prince George of Wales, Britain's Prince William, Prince of Wales, Britain's Prince Louis of Wales, Britain's Catherine, Princess of Wales, Britain's Princess Charlotte of Wales, Britain's King Charles III, Britain's Queen Camilla, Britain's Sophie, Duchess of Edinburgh, and Britain's Prince Edward, Duke of Edinburgh, pose on the balcony of Buckingham Palace after attending the King's Birthday Parade "Trooping the Colour" in London on June 15, 2024. The ceremony of Trooping the Colour is believed to have first been performed during the reign of King Charles II. Since 1748, the Trooping of the Colour has marked the official birthday of the British Sovereign. Over 1500 parading soldiers and almost 300 horses take part in the event.

Members of the Household Division, including the regimental Irish Wolfhound mascot Turlough Mor take part in Britain's King Charles' Birthday Parade in London, Britain June 15, 2024.

Princess Kate and her son, Prince Louis, during Trooping the Colour at Horse Guards Parade on June 15, 2024 in London. Crowds lining the streets waved and cheered as the carriage went past.

Kate, wearing a pale outfit, arrives with her children Princess Charlotte and Prince George before the "Trooping the Colour", an annual military parade near Buckingham Palace that marks the official birthday of the British monarch, King Charles, in London on June 15, 2024.

Catherine, Princess of Wales, (R) arrives with Prince William, Prince of Wales, and their children Princes George and Louis to Buckingham Palace before the King's Birthday Parade "Trooping the Colour" in London on June 15, 2024. Catherine, Princess of Wales, is making a tentative return to public life for the first time since being diagnosed with cancer, attending the Trooping the Colour military parade in central London.

Britain's Catherine, Princess of Wales, smiles next to Britain's Princess Charlotte of Wales (R) and Britain's Prince Louis of Wales (C) inside the Glass State Coach on their way to Horse Guards Parade for the King's Birthday Parade "Trooping the Colour" in London on June 15, 2024. Catherine, Princess of Wales, is making a tentative return to public life for the first time since being diagnosed with cancer, attending the Trooping the Colour military parade in central London.

Britain's Catherine, Princess of Wales, shelters from the rain with an umbrella as she walks with her children Britain's Prince George of Wales (C), Britain's Princess Charlotte of Wales (R) and Britain's Prince Louis of Wales back to the Glass State Coach at Horse Guards Parade during the King's Birthday Parade "Trooping the Colour" in London on June 15, 2024. Catherine, Princess of Wales, is making a tentative return to public life for the first time since being diagnosed with cancer, attending the Trooping the Colour military parade in central London.

Britain's Catherine, Princess of Wales, rides the Glass State Coach at Horse Guards Parade during the King's Birthday Parade "Trooping the Colour" in London on June 15, 2024. Catherine, Princess of Wales, is making a tentative return to public life for the first time since being diagnosed with cancer, attending the Trooping the Colour military parade in central London.

(From L) Britain's Prince George of Wales, Britain's Prince William, Prince of Wales, Britain's Prince Louis of Wales, Britain's Princess Charlotte of Wales and Britain's Catherine, Princess of Wales, stand on the balcony of Buckingham Palace after attending the King's Birthday Parade, "Trooping the Colour", in London, on June 15, 2024.

(L-R) Britain's Prince Richard, Duke of Gloucester, Britain's Birgitte, Duchess of Gloucester, Britain's Prince George of Wales, Britain's Prince William, Prince of Wales, Britain's Prince Louis of Wales, Britain's Princess Charlotte of Wales, Britain's Catherine, Princess of Wales, Britain's King Charles III, Britain's Queen Camilla, Britain's Sophie, Duchess of Edinburgh, Britain's Prince Edward, Duke of Edinburgh, Britain's Lady Louise Windsor, Britain's Princess Anne, Princess Royal, Vice Admiral Timothy Laurence and Britain's Prince Edward, Duke of Kent, pose on the balcony of Buckingham Palace after attending the King's Birthday Parade "Trooping the Colour" in London on June 15, 2024.

Britain's Catherine, Princess of Wales, rides inside the Glass State Coach at Horse Guards Parade after the King's Birthday Parade "Trooping the Colour" in London on June 15, 2024. Catherine, Princess of Wales, is making a tentative return to public life for the first time since being diagnosed with cancer, attending the Trooping the Colour military parade in central London.

Britain's King Charles arrives for the Trooping the Colour parade which honors his official birthday in London, Britain, June 15, 2024.

Britain's William, Prince of Wales, Catherine, Princess of Wales, Prince George, Princess Charlotte, Prince Louis appear on the balcony of Buckingham Palace as part of the Trooping the Colour parade to honour Britain's King Charles on his official birthday in London, Britain, June 15, 2024.