During the Order of the Garter Service at Windsor Castle, the Princess of Wales was there to support her husband, Prince William.
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Middleton wore a white dress with black spots by Alessandra Rich and a hat by Philip Treacy that went with it.
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Prince William, who will be 41 on Wednesday, walked in the parade for the first time as the heir to the throne.
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He wore the traditional hat with ostrich feather plumes. He wore his Order of the Garter jewelry to the coronation of King Charles in May.
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The Prince of Wales and his wife have been going to the event for years.
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He was made a knight in the Order of the Garter in 2008, which was also the first time Middleton went with him. This was three years before they got married.
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Middleton's presence at the time showed that she was being accepted into the royal family. Two years later, Prince William asked Princess Diana's ring to be his bride-to-be.
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With Queen Camilla by his side, King Charles III led the parade, which was his first as king of the country.
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