The Queen has appeared as a hologram waving to the crowds from the Gold State Coach during the London street pageant – one of the main events of the Platinum Jubilee celebrations.
The 260-year-old carriage had taken her to and from her coronation in 1953.
Today the coach, flanked by guardsmen on horseback, featured archival footage of Her Majesty, making it seem as if she was inside.
The three-kilometre parade, led by the carriage, is divided into four acts, the first featuring a military procession.
Around 10,000 people are involved, including a cast of 6,000 performers, on the final day of the jubilee weekend marking the Queen’s 70 years on the throne.
Also in the pageant, celebrities will travel in decorated open top double decker buses for the decade-by-decade celebrations.
And a peloton of 300 cyclists, riding vintage bikes from across the seven decades of the Queen’s reign, will travel down The Mall led by Sir Chris Hoy and cycling golden couple Dame Laura and Sir Jason Kenny.
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The carnival procession began at the Palace of Westminster and went along Whitehall to Admiralty Arch and then down The Mall to the Queen Victoria Monument outside Buckingham Palace.
It then turned on to Birdcage Walk and along St James’s Park.
The procession comes as millions of people across the UK are taking part in patriotic street parties, picnics and barbecues on day four of the Platinum Jubilee weekend.
At The Oval cricket ground in south London, Prince Charles and the Duchess of Cornwall attended a Big Jubilee Lunch, along with around 500 other guests, including 70 “platinum champions” from the Royal Voluntary Service and celebrity ambassadors for the charity.
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The four acts in the pageant are: For Queen And Country, The Time Of Our Lives, Let’s Celebrate, and Happy And Glorious.
The military parade involves 1,750 people and 200 horses – one of the biggest spectacles in British history – from the Army, Navy, RAF, and the Commonwealth.
The second act is a “vibrant display of British life since 1972” and a celebration of culture, music, and technology of the past 70 years.
The third section, Let’s Celebrate, will tell the story of the Queen’s life in 12 chapters, with a nod to her corgis and her beloved horses.
The Queen will be depicted in her younger days with a 20ft puppet of a youthful princess surrounded by a pack of mischievous puppet corgis.
It will also feature a 21ft-tall puppet dragon with a wingspan as wide as the Mall, while her purple and white coronation robe will be recreated by 80 dancers flanked by twirling “baianas”.
The final act will take place in front of the palace around the Queen Victoria Memorial.
Ed Sheeran will perform a musical tribute at around 5pm.
It is hoped the monarch will make an appearance on the Buckingham Palace balcony.
Around 200 ‘national treasures’ will take to the stage to serenade the Queen by singing the national anthem at the grand finale of the festivities.
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Members of the public are also invited to join in with the anthem, which will be led by a gospel choir and the Band of Her Majesty’s Royal Marines.
Other celebrities taking part include Sir Cliff Richard, Jeremy Irons, Jayne Torvill and Christopher Dean, Gary Lineker, Rosie Jones, Kadeena Cox, Alan Titchmarsh, Heston Blumenthal, James Martin, Bill Bailey and Gok Wan.