In one cheeky moment, he was seen turning to his father, who looked smart in a military uniform, and sternly brushing down the shoulder of the future King’s jacket.
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Louis sat next to his older siblings Charlotte, 10, and George, 11, on the front row of a specially built dias on the Queen Victoria Memorial outside the Palace as thousands of people packed the streets.
The youngster also observed a smartly dressed George flicking his hair out of his eyes with his hands and promptly mimicked the gesture, readjusting his own hair.
Fans shared their appreciation of the cute moment when a video of it was shared on X, with one writing: “Prince Louis copying his brother Prince George is so funny.”
“God love that child!” another added and a third enthused: “He is the sweetest thing!”
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Hundreds of street parties are also being held across the country while a procession of 1,300 Armed Forces members made their way from Parliament Square to the Mall.
The royal family also watched a flypast of the Royal Air Force plans from the Palace balcony, before King Charles hosts a tea party for WWII veterans.

PA Wire
Armed forces from Nato allies joined the procession in London to mark the end of the Second World War in Europe, as Sir Keir Starmer said this week’s events are a reminder that victory was “not just for Britain”.
Personnel from the US, France and Germany took part in the military procession in London on Monday as part of the events.
The words of Sir Winston Churchill’s 1945 victory speech, spoken by actor Timothy Spall, began the commemorations.

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There was a display by the Red Arrows as part of a flypast by 23 current and historic military aircraft.
The events will start the build-up to Thursday, May 8, which marks exactly 80 years since the Allies formally accepted Germany’s surrender.