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Kate Middleton’s final 2025 gala: Princess Diana’s tiara and state banquet highlights

This tiara defines her role as Princess of Wales.

DECEMBER 3, 2025 3:42 PM ESTDEC 3, 2025, 3:42 PM EST

Kate Middleton will be stepping out for her final gala dinner of the year. The event will take place at a State Banquet at Windsor Castle, hosted by King Charles and Queen Camilla in honor of German President Frank-Walter Steinmeier and First Lady Elke Büdenbender, who are on a state visit to the United Kingdom.

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This promises to be one of the highlight evenings of 2025, featuring speeches from both the British monarch and the German president. It will be another occasion for the Princess of Wales to command the spotlight. With just hours to go until the event, we revisit the other two gala dinners she attended in 2025.

Catherine, Princess of Wales attends the State Banquet at Windsor Castle on July 08, 2025 in Windsor, England. President Emmanuel Macron and Mrs Brigitte Macron visit the UK in the first visit State Visit made by France in 17 years.

The first State Banquet Kate Middleton attended in 2025 took place last July, welcoming President Emmanuel Macron and First Lady Brigitte Macron at Windsor Castle. It was the perfect stage for the Princess’s highly anticipated return.

Prince William, Prince of Wales and Catherine, Princess of Wales attend the State Banquet at Windsor Castle on July 08, 2025 in Windsor, England.

She looked stunning in red, wearing a silk Sarah Burton gown for Givenchy, and sporting Diana’s favorite tiara, the Cambridge Lover’s Knot, the piece with the highest institutional significance accessible to her.

France's President Emmanuel Macron clinks glasses with Catherine, Princess of Wales during the State Banquet for President of France Emmanuel Macron and his wife Brigitte Macron, at Windsor Castle on July 8, 2025 in Windsor, England.

This tiara defines her role as Princess of Wales. A neoclassical design of diamonds and pear-shaped pearls originally made for Queen Mary of Teck, Charles III’s great-grandmother, it became Diana’s most-worn tiara and is now Kate’s favorite as well.

Catherine, Princess of Wales arrives for the State Banquet hosted by King Charles III and members of the Royal Family at Windsor Castle during the state visit by the President of the United States of America

Kate’s second high-profile dinner of the year was the most talked-about. In September, she appeared sublime in a floral lace gown, once again wearing Diana’s tiara, for a State Banquet in honor of U.S. President Donald Trump and First Lady Melania.

She complemented the look with cluster diamond earrings and a central piece featuring a gradient of diamonds from Queen Elizabeth II’s collection.

Catherine, Princess of Wales and Prince William, Prince of Wales arrive for the State Banquet hosted by King Charles III and members of the Royal Family at Windsor Castle during the state visit by the President of the United States of America

The Princess left such an impression that President Trump could only offer praise, “Seeing Her Royal Highness, Princess Kate, so radiant, so healthy, so beautiful. It’s a great honor,” he said.

Catherine, Princess of Wales, toasts US President Donald Trump after his speech during the State Banquet at Windsor Castle for the State visit by the President of the United States of America

We'll see whether Kate Middleton will once again choose Princess Diana’s tiara for this important evening and which symbolic, likely priceless, jewels she will select for the last major dinner at Windsor Castle of the year.