Prince Louis went viral over the weekend for his mischievous behaviour at the Queen’s Platinum Jubilee.
The chaos began at the Trooping the Colour ceremony when the prince, four, hilariously covered his ears as planes flew overhead.
Then, at the Jubilee Pageant, he told his mum, the Duchess of Cambridge, to be quiet before sticking his tongue out at her.
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But what no one noticed was that when he misbehaved at the pageant, his sister Princess Charlotte, seven, was quick to put the four-year-old in his place.
In footage of the event, the Duchess could be seen telling him to put his fists down, and when she failed, his sister intervened.
Princess Charlotte took her younger brother’s hand and placed it firmly back onto his lap.
The princess also helped control the four-year-old when he jumped out of his seat, and she helped him back into it.
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They Cambridges tweeted about the weekend’s events, writing: "What a fantastic weekend of celebrations.
"Seeing people across the nation coming together with family, friends and loved ones has been extremely special.
“Thank you to everyone who turned out to show their gratitude to The Queen and her inspiring 70 years of leadership. From the crowds on the Mall to communities hosting street parties up and down the country, we hope you had a weekend to remember."
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The Cambridges also addressed their mischievous son, writing: "We all had an incredible time, especially Louis... "
Mike Tindall, a former England rugby player who is married to Zara Tindall, the queen's eldest granddaughter, later revealed why the prince was being so mischievous.
He made the revelation on his podcast The Good, The Bad and The Rugby.
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Tindall's co-hosts James Haskell and Alex Payne said that Prince Louis was the 'star of the show' and he replied: "Louis was just wanting to have fun.
"And my two are always mischievous, so it was just trying to keep a lid on it. There were a lot of sweets out back though, so they had complete sugar-highs."
He added: "It was tough for them, they’re all young, asking them to sit in there from two until five is a long time. As any parent knows, you just do whatever needs to be done.
Tindall added that he had a 'lovely weekend', and said: "It was outstanding to be fair, it was just great to be a part of.”
Emma Guinness