During the event, the King gave a historic speech during which he called for a global commitment to restoring peace as he paid tribute to the service and sacrifice of the wartime generation.

Echoing his grandfather, Charles delivered his address at 9pm - the exact time King George VI spoke to the nation in a radio broadcast on May 8, 1945, to mark the end of the Second World War in Europe.

Charles described the allied victory as "a powerful reminder of what can be achieved when countries stand together in the face of tyranny".

In a lighter moment, the King joked to the concert-goers that he did not have the energy to "lead you all in a giant conga from here back to Buckingham Palace" after he read an extract from his late mother Queen Elizabeth II's personal diary about how she famously celebrated and danced incognito among the crowds in London

Now, according to body language expert Judi James, it was at this moment that Kate's reaction revealed her role within the Firm and the type of relationship she has with the late monarch and Charles himself.

She told the Mirror: "Her 'moment' came as she watched Charles making his speech.

"When he came to the quotes from the late Queen, Kate's smile became one of warm reflection, hinting at the warm relationship she had with the late Queen and also at an empathetic relationship of warmth that she might have with Charles himself, whom she was watching.

"Her cheeks became rounded, and her hands were clasped in front of her torso in a look of warmth as well as some sadness."

Regarding Kate's appearance alongside William, the expert dubbed them a "power couple" and analysed their body language.

She said: "William walked with an elegant puffing of the chest to accommodate the line of medals while Kate adopted a more youthful look to her upswept, immaculate hair and styling during the daytime service. With her hair hanging in loose curls topped with a Gen Z-style large floppy bow that was also a nod to the 'Pollyanna' fashion trend of Victoriana soon after the War, Kate teamed a Chanel-style jacket with a full, flowing white lace skirt, ticking another very current box in terms of teaming tweeds with layers of lace and pearls.

"The 'Disney Prince' look was totally complimentary with Kate's girlish froth and curls, and William adopted a rather serious, alpha facial expression on arrival to complement his wife's more romantic styling and smiles."