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.
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.
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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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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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.
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.
The ceremonies will be attended by other invited royals and high-ranking dignitaries, including Britain's Prince Charles and the Duchess of Cornwall, Prince Felipe and Princess Letizia of Spain and Denmark's Crown Prince Frederik and his wife.
Hussain's hanging was due to take place during the royal trip by the prince and the Duchess of Cornwall in October, but it was initially delayed until 31 December after the prince wrote to Pakistani Prime Minister Shaukat Aziz.
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.
It became an even more grand event when the Duke and Duchess of Cornwall arrived, walking down the line of tables and even stopping to sit down on a potentially soggy seat to chat to some of those munching their food.
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.
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).
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