Prince Louis' adorable appearance at Trooping the Colour during the RAF flypast brought out a "childlike excitement" in the Queen, according to a body language expert.
The four-year-old could be seen momentarily covering his ears as the noisy planes roared overhead during the event that kicked off four days of celebration for the Queen's Platinum Jubilee.
Before that, he could be seen waving at the planes and chatting to the Queen during the incredible display.
At one point, he appeared to yawn, as his mother the Duchess of Cambridge whispered in his ear before he turned to his great-grandmother to ask a question.
And according to body language expert Judi James, Louis' cute and spontaneous behaviour had clearly rubbed off on the 96-year-old monarch, who was seen smiling throughout the spectacular flypast.
Judi told the Mirror: "William and Kate emerged wearing their serious facial expressions, with William directing their children into position before standing apart from Kate to ensure a good spread of parental guidance.
"As the fly-past evolved though, we were treated to the strength of the bonds between the Queen and little Louis. His body language was the most spontaneous and at one point he even moved in front of the Queen.
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"Leaning over the balcony, looking a lot like Prince Charles did at his mother’s coronation, his body language signals veered between an impatient slapping of his hands on the balcony to some face-rubbing and head-holding that suggested he couldn’t wait to see the planes.
"The Queen looked over at him with an indulgent facial expression though, chatting to her great-grandson as well as Kate. By the time the Lancaster flew over it looked as though Louis’s excitement had brought out some childlike excitement in the Queen, too.
"She clearly loved the roar of the engines and as Louis literally jumped up and down at the sight of the Red Arrows, the Queen smiled and chatted as though sharing the moment."
Earlier today cheers went up from thousands of spectators on The Mall as they caught sight of Louis with his older brother and sister Prince George and Princess Charlotte with proud mum Kate and the Duchess of Cornwall in a carriage.
The traditional carriage procession left Buckingham Palace ahead of Trooping the Colour, also known as the Birthday Parade – the start of four days of festivities honouring the Queen.
The young Cambridges and the duchesses’ carriage, known as a barouche, was followed by another carrying the Earl and Countess of Wessex and their children Lady Louise Windsor and Viscount Severn.
George, eight, Charlotte, seven, and four-year-old Louis smiled and waved enthusiastically as they sat in a row, with Louis the youngest in the middle of his older siblings. At one point, Charlotte took charge and pushed Louis’s hand down as he continued waving.
Earlier, the Queen joined her cousin the Duke of Kent on the famous frontage to take a salute of her soldiers returning from Trooping the Colour, after the Prince of Wales deputised for her on the parade ground.
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