Princess Kate returns at Trooping the Colour amid cancer treatment

From left: Prince George, Britain's Prince William, Prince Louis, Princess Kate, Princess Charlotte, King Charles III, Queen Camilla, Sophie, Duchess of Edinburgh, and Prince Edward, Duke of Edinburgh, pose on the balcony of Buckingham Palace after attending the king's Trooping the Colour birthday parade 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 King Charles' birthday parade in London on 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 III, in London on June 15, 2024.

Princess Kate arrives with Prince William and their children Princes George and Louis to Buckingham Palace before Trooping the Colour in London on June 15, 2024. The 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.

Catherine, Princess of Wales, smiles next to Princess Charlotte of Wales, right, and Prince Louis of Wales, center, inside the Glass State Coach on their way to Horse Guards Parade for Trooping the Colour in London on June 15, 2024. Princess Kate is making a tentative return to public life for the first time since being diagnosed with cancer.

Princess Kate shelters from the rain with an umbrella as she walks with her children, Prince George, center, Princess Charlotte, right, and Prince Louis back to the Glass State Coach at Horse Guards Parade.

Princess Kate rides the Glass State Coach at Horse Guards Parade during Trooping the Colour.

From left: Prince George, Prince William, Prince Louis, Princess Charlotte and Princess Kate stand on the balcony of Buckingham Palace after attending the Trooping the Colour in London on June 15, 2024.

From left: Prince Richard, Duke of Gloucester, Birgitte, Duchess of Gloucester, Prince George, Prince William, Prince Louis, Princess Charlotte, Princess Kate, King Charles III, Queen Camilla, Sophie, Duchess of Edinburgh, Prince Edward, Duke of Edinburgh, Lady Louise Windsor, Princess Anne, Vice Admiral Timothy Laurence and Prince Edward, Duke of Kent, pose on the balcony of Buckingham Palace after attending the king's Trooping the Colour birthday parade in London on June 15, 2024.

Princess Kate rides inside the Glass State Coach at Horse Guards Parade on June 15, 2024.

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

Prince William, Princess Kate, Prince George, Princess Charlotte and Prince Louis appear on the balcony of Buckingham Palace as part of the Trooping the Colour parade to honor King Charles III on his official birthday in London on June 15, 2024.