EXCLUSIVE: Prince Louis had an adorable interaction with his grandfather, King Charles, today.

King Charles had an adorable interaction with his grandson, Prince Louis, during his birthday parade today, a lip reader told the Express. The King led the Royal Family out in London today to mark Trooping the Colour in what was a day filled with pomp and pageantry.

His Majesty celebrated his official birthday with an eco-friendly flypast by the Red Arrows and remembered all those killed in the Air India plane disaster. But during the Royal Family’s appearance on the balcony, he appeared to make a comment to Prince William and Princess Kate’s yougest child.

Lip reading expert Nicola Hickling said there was a moment when the red arrows passed above Buckingham Palace and the monarch appeared to tap on Louis’s shoulders.

King Charles made a comment to his grandson, Prince Louis, during Trooping the Colour (Image: PA)

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The expert claimed the King said: “Ooh it’s your favourite plane!”

Elsewhere, the King was spotted speaking to his son about the aircraft’s demonstration, saying to William: “It depends on how much projection they use.”

The heir to the throne replied: “Yes, yes,” before his father urged him to go inside.

But the prince added: “They may pass again.”

The royals acknowledged the crowds and watched an aerial display of vintage and modern aircraft with the Red Arrows’ finale powered by a blend of sustainable aviation fuel.

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The King celebrated his official birthday today in London (Image: PA)

The world-famous acrobatic team also used vegetable oil to produce their trademark red, white and blue vapour trails over the royal residence – believed to be a first.

Trooping, also known as the King’s Birthday Parade, fell silent after Charles had inspected hundreds of troops on Whitehall’s Horse Guards Parade from a carriage with the Queen by his side.

The moment of reflection acknowledged the aviation disaster on Thursday that killed 241 passengers and crew, including more than 50 British nationals, and around 30 people on the ground.