Prince Louis was spotted blowing raspberries and attempting to cover his mum's mouth in a cheeky display during the Sunday pageant.
The Duchess of Cambridge kept a watchful eye over her four-year-old son who could be seen pulling a series of funny expressions.
The prince wandered over to sit on Prince Charles's lap and even upturned his nose with his thumb during the show as it was evident that he was growing tired and restless, reports the Mirror.
Mike Tindall could be seen joking with the youngster as he playfully warned him to behave.
The young Prince interrupted his mischievous behaviour, however, to dance enthusiastically and eat a chocolate biscuit.
He joined his siblings, Princess Charlotte and Prince Louis and parents, the Duke and Duchess of Cambridge, in the royal box to watch the pageant.
He also stole the show during Trooping The Colour after he was wowed by the Red Arrows.
He was photographed chatting to his great-grandmother The Queen as they watched on from the balcony of Buckingham Palace.
On social media, one royal fan wrote: "Oh my Gosh!!!! I can't!! Cuteness overload!! Prince Louis is so freaking adorable!"
Another wrote: "Prince Louis is stealing the show once again."
A third added: "This child is a joy to watch (probably a handful to parent!) but what a super little character he appears to be!"
The four-day spectacle to mark the Queen's incredible 70-year reign finishes today with the Platinum Jubilee Pageant.
Royal revellers lined the Mall to watch the incredible display, that followed a similar route to the Queen's coronation in 1953.
Other royals in the Jubilee Pageant’s box are the Prince of Wales and the Duchess of Cornwall and the Duke and Duchess of Cambridge.
The Princess Royal and Vice Admiral Sir Tim Laurence are also there with Princess Beatrice and her husband Edoardo Mapelli Mozzi, and Princess Eugenie and her husband Jack Brooksbank.
Anne’s son Peter Phillips is joined by his children Savannah and Isla, while Zara and Mike Tindall and the Duke and Duchess of Gloucester have also made an appearance.
Princess Eugenie could be seen bouncing son August on her knee - in his first public appearance.
The one-year-old is wearing a jumper with a Union flag on the front.
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