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".
BBC: Prince Charles 'heartbroken' by plight of Syrian refugees
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.
Quintessentially was founded in 2000 by Ben Elliot, the Duchess of Cornwall's nephew.
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.
The evening was an informal occasion and the Prince of Wales and Duchess of Cornwall mingled casually with their guests.
John Davies, from Llangollen, plans to put the fruit cake from the wedding of Prince Charles and Camilla, Duchess of Cornwall on show.
BBC: NEWS | UK | Wales | North East Wales | Royal wedding cake sold on web
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.
Before the majestic fireworks display and the heart-thumping national anthem, Barlow led the Queen, the Duchess Of Cornwall and Prince Charles on stage.
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.
BBC: The princes say they want both sides of the family to attend
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.
BBC: Ceredigion June floods: 15 families able to return home
Later that evening, he lept on to the bonnet of a Jaguar car driving up Regent Street in a royal convoy containing the Prince of Wales and Duchess of Cornwall.
The mania grew buzzier in 2011, when a press leak revealed that Catherine, Duchess of Cambridge, tried a venom mask before the royal wedding on the recommendation of Camilla, Duchess of Cornwall.
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.
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