Prince Louis appears to have met his match, after his no-nonsense sister Charlotte forced him to behave in a viral video clip from the Platinum Jubilee celebrations.
The Cambridge's youngest won the hearts of may royal fans over the weekend with his cooky characteristics - especially on the Buckingham Palace balcony following Trooping the Colour.
The four-year-old even cracked a smile from Queen Elizabeth II - who enjoyed her great-grandson's cheeky display and lack of regards to the typical royal airs and graces.
Read more: What Supernanny says on way Duchess of Cambridge dealt with Prince Louis at Jubilee celebrations
The Mirror reports that Louis was spotted pulling a series of funny faces, while covering his ears during the RAF flyover and then rubbing his eyes and looking utterly bored on other occasions. He also got in trouble with his mum Kate, attempting to get her to stop talking by putting his hand over her mouth before sticking his tongue out.
Louis was then on the move and as well as sitting on his father's knee, he also headed to his grandfather Prince Charles' lap during the final official ceremony of the weekend.
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Louis' parents got some help in controlling him from his sister Charlotte, seven, during the celebrations - and she also wasn't afraid to show her older brother George, eight, how to behave. Hilarious footage shows the princess taking matters into her own hands with Louis during the Platinum Pageant last Sunday.
Louis appeared to be causing a disturbance as he bit his fist and flailed it through the air.
The Duchess of Cambridge began by gently seeming to place her hand on the prince in an attempt to calm him down, but when the four-year-old continued unabated, Charlotte decided to step in, firmly taking Louis' hand and putting it in his lap.
Charlotte also helped his mum during the same event by trying to get him to sit back down when he jumped up during the same event. The princess then stepped in to tell her older brother George to behave at the end of the pageant.
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Members of the Royal Family were singing the national anthem "God Save the Queen" on the Buckingham Palace balcony.
And when the eight-year-old put his hand on the edge of the balcony, Charlotte nudged him and told him to stand up straight.
Louis was also mentioned by William and Catherine when they thanked everyone who turned out for the long weekend of celebrations marking the Queen's 70-year reign.
They stated: "We all had an incredible time, especially Louis... "
In a personal message, alongside images from the weekend's events, they also tweeted: "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."
Did you catch much of the Queen's Platinum Jubilee coverage?
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