Queen Camilla led the Royal Family at today's royal memorial service in the absence of King Charles and Prince William.
The memorial service is being held in honour of the late King Constantine of the Hellenes at St George's Chapel.
The Queen, 76, arrived at today's memorial service alongside Queen Anne-Marie, the wife of the late Greek King.
They arrived separately from the rest of the British royals, which included Princess Beatrice, Prince Andrew, Sarah Ferguson, Zara Tindall and Mike Tindall.
Queen Camilla at today's memorial service
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Queen Camilla and Anne-Marie entered St George's Chapel at the Galilee Porch entrance.
The two Queens were driven down the hill at Windsor Great Park in the State Bentley for the occasion.
Camilla led the Royal Family at Windsor Castle today in place of her husband, King Charles.
The King, 75, has temporarily stepped back from all public-facing royal duties since he was diagnosed with a "form of cancer".
Queen Camilla wore two silver leaf brooches and pearl earrings for today's service
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Meanwhile, the Prince of Wales, 41, also could not attend today's memorial service.
The prince pulled out of attending due to a personal matter, according to Kensington Palace.
Kate, Princess of Wales, who is recovering from abdominal surgery, is thought to be doing well.
The Prince of Wales called the Greek Royal Family to let them know he was unable to attend.
Sarah Ferguson and Prince Andrew joined Queen Camilla at today's service
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Zara Tindall, Mike Tindall and Princess Anne also were in attendance
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The late King Constantine of Greece, who died in January last year, was William’s godfather.
Other royals attending today's memorial service included King Felipe and Queen Letizia of Spain.
The royal couple were understood to have met Queen Camilla at Windsor Castle prior to today's service.