This year, she'll be accompanied by the Duchess of Cornwall for her Queen's Speech debut.
It's the Duchess of Cornwall, who appeared to mark the show's 60th anniversary.
The Duchess of Cornwall echoed her husband's sentiments, and said she found the experience "very humbling".
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Prince Charles and the Duchess of Cornwall have begun a week-long tour of Wales.
The JCB Academy in Staffordshire has been officially opened by the Prince of Wales and the Duchess of Cornwall.
The Prince of Wales and the Duchess of Cornwall visited parts of London hit by recent violence and looting.
It will be followed by an evening banquet at Buckingham Palace hosted by Prince Charles and the Duchess of Cornwall.
Prince Charles and the Duchess of Cornwall were welcomed by children from a nearby school singing songs Bob Marley made famous.
The week before, her royal parents-in-law Prince Charles and Camilla, Duchess of Cornwall, watched Federer outpower and outplay the Italian Fabio Fognini.
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In January it was revealed HRH The Duchess of Cornwall had become the first official Patron of the Cornwall Air Ambulance Trust.
The Duchess of Cornwall has gone for something a little bit different.
The Prince of Wales and the Duchess of Cornwall will spend time with athletes from a broad cross section of Commonwealth countries.
Later the prince and the Duchess of Cornwall toured a Waitrose store in Belgravia, close to their Clarence House home in central London.
Among the guests will be Prince Charles and the Duchess of Cornwall, the prime minister, and archbishops and bishops from around the world.
One boost for Games organisers came with confirmation that the Prince of Wales and Duchess of Cornwall will attend the Commonwealth Games opening ceremony.
Inside, the congregation included Prince Charles and the Duchess of Cornwall, the Duke and Duchess of Cambridge, Prince Harry and UK Prime Minister David Cameron.
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Mark Leishman, the private secretary to the Prince of Wales and Duchess of Cornwall, has been appointed a Lieutenant of the Royal Victorian Order (LVO).
It hails the Duchess of Cornwall for - "amazingly" - one of the day's best outfits, whilst giving more withering assessments of Princesses Beatrice and Eugenie.
The service was attended by Guernsey's Lieutenant Governor Sir Fabian Malbon, who officially represented the Prince of Wales and the Duchess of Cornwall, and the Bailiff Geoffrey Rowland.
Prince Charles and the Duchess of Cornwall were travelling to the Royal Variety Performance at the London Palladium in a distinctive Rolls-Royce Phantom VI when the incident occurred.
The Duchess of Cornwall had been due to attend the event, hosted by Myleene Klass, but was forced to pull out due to a middle ear infection and sinusitis.
It has also been confirmed the senior royals, including their stepmother the Duchess of Cornwall, will attend the memorial service on 31 August, the actual anniversary of Diana's death.
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Prince Charles made a donation to the fund, and he and the Duchess of Cornwall met some of the flood victims and the emergency services in Aberystwyth on 9 July.
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For this reason the Duke and Duchess of Cornwall have been taking on far more high profile engagements recently as they prepare for the day they will formally replace the queen.
They escort their royal visitor around different locations - a role undertaken by Lady Mary on Thursday when she accompanied Prince Charles and the Duchess of Cornwall to the Royal Cornwall Show.
The couple visited Westminster Abbey, where the president laid a wreath at the Grave of the Unknown Warrior, and went to see the Prince of Wales and the Duchess of Cornwall at Clarence House.
There's more to the Duchess of Cornwall than you see: invariably she manages to win people round when she comes face to face with them, despite the Diana back-story we all know so well.
Later, the Prince of Wales and Duchess of Cornwall, The Duke and Duchess of Cambridge and Prince Harry will join the queen and Prince Philip for a Diamond Jubilee lunch provided at Westminster Hall.
The Queen attended the service, along with the Prince of Wales and Duchess of Cornwall, Prince Harry, and the Queen's granddaughter Zara Phillips with her husband Mike Tindall, whom she married earlier this year.
It will carry other royals who have not been named yet, but are likely to be the Prince of Wales and the Duchess of Cornwall, and the Duke and Duchess of Cambridge and Prince Harry.
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