Kate joined her husband and other members of the Royal Family for a service at Westminster Abbey followed by a presentation of new Queen's Colour to the Royal Air Force and a flypast viewed from the balcony at Buckingham Palace.
Anyone meeting Meghan Markle for the first time might easily be star-struck - a well-known actress turned duchess isn't someone you come across very often.
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She attended her brother-in-law's wedding in May, Trooping the Colour in June, and now the RAF centenary commemorations.
For royal fashion fans that meant two more opportunities to see the Duchess of Sussex in action and see how her style is evolving.
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When Prince George was baptized in 2013, she wore a soft cream Alexander McQueen coat (which she again re-wore later).
And amid turmoil in the Cabinet and her Government, Mrs May delivered a reading at the service, Hebrews 11:32-12:2, with the head of the RAF Air Chief Marshal Sir Stephen Hillier also taking to the lectern.
Prince Louis was christened at the Royal Chapel at St. James on Monday.
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Charles, Camilla, William, Kate, Harry and Meghan will also meet veterans, personnel, charity representatives and those from the civil service in a reception after the spectacle. Note that the colors of all three outfits have similarities, the wife of Prince William three wore light suits. The hat featured white flower details.