Following their appearance on Buckingham Palace balcony for this year's Trooping the Colour celebration, a lip reader claims to have picked up on several chit-chats had between the Royal Family.
In particular, body language expert Jeremy Freeman believes the Princess of Wales gave her youngest son, the notoriously mischievous Prince Louis, a right telling-off.
For those who didn't catch wind of this weekend's celebrations, on Sunday 15 June - which just so happened to be Father's Day in the UK - the nation came together to celebrate the official birthday of King Charles III.
Despite the monarch actually being born in November, a parade takes place each June to commemorate the 76-year-old's actual birth, for which the Royal Family flocks together on his resident's balcony.
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Among those on full display this year were the Wales: Prince William and his wife, Kate Middleton, and their three children, Prince George, 11, Princess Charlotte, 10, and Prince Louis, seven.
Last year, the youngest of the trio went viral after Charlotte was spotted attempting to keep her younger brother in line.
At the time, Louis - who ceaselessly steals the show during public outings by dancing, erratically waving or simply appearing deeply unimpressed - was told by Charlotte to 'put your hands down' after he went wild National Anthem.
Unfortunately for mum Kate, however, it seems Louis failed to learn anything from last year's sibling scolding, and she was forced to issue her youngest with some strict instructions again this year.
Louis could be seen gazing in wonder during the Royal Air Force flypast from his seat on the balcony, after which he began smiling toothlessly at those in attendance below.
It was then that 'God Save the King' broke out, after which 43-year-old Kate turned to the youngster - who'd remained seated - before telling him, 'National anthem, Louis stand', according to Freeman.
According to another lip reader, another scandalous moment took place earlier in the day, when Charles allegedly made a dig in the direction of his estranged son, Prince Harry, during a conversation with Camilla in the carriage.
Speaking on behalf of Fruity King, Hickling told press that The King had admitted he's 'sick of Harry moaning' before touching on another 'issue'.
"What are you going to do about it," Camilla is said to have asked in response, after which Charles described the situation as 'messy' before.
He allegedly added that he will 'talk to Harry', before telling Camilla: "Wave and smile so that we can keep talking."
"Yes. What else did he want?" Camilla is said to have questioned, with Charles again responding of Harry: "He keeps dragging it all up, there seems to be another issue, right now."
Camilla then reportedly asked, 'What are you going to do about it?', to which her husband replied: "We will tackle it sooner or later, It's all very messy and I will talk to Harry. That'll be fun."
"Oh yes, problematic," his wife finally adds.
Topics: Kate Middleton, King Charles III, Prince Louis, Royal Family, UK News, Prince Harry
Rhianna Benson