Kate and Prince William visited Warsaw in 2017 and attended the Queen’s Birthday Garden Party at the Orangeryeduring on July 17.
But the body language expert claimed that Kate looked less than impressed in several snaps, but said that it was very uncharacteristic of the usually smiley royal.
Judi commented: “When we see a photo of a royal looking angry or stressed it can often be a body language ‘flash’, i.e. a very fleeting facial expression that has been taken out of context.
“When we see the whole footage the message can be completely different, especially if it’s a royal like Kate, who is normally known for her pitch-perfect social smiles that she can keep in place without looking strained or inauthentic for long periods of time.
“Unlike Diana, whose facial expressions could show powerfully fluctuating emotional states, Kate is an accomplished masker, meaning she does her job in exactly the way she is expected to, without any flicker of negative emotions on her face.
“Except for this occasion back in 2017 on William and Kate’s visit to Warsaw. Kate’s unsmiling facial expression looked shocking and it wasn’t just a ‘flash’.
“There are several photos of the occasion that show her looking unhappy or even throwing William some pointed looks while he tried to remain neutral, with a faint, polite, closed lip smile of what looked like regret or awkwardness.
“Kate’s eyes looked tired, with dark smudges underneath them and at one point she appeared to be looking down while biting the inside of her mouth as though holding back her emotions.
“As she looked out towards the waiting guests her arms looked rigid and her eye expression wary.”
According to the expert, this “unique body language” from the royal did not go unnoticed, prompting “rumours that the couple were arguing and that Kate was furious with her husband”.
However, in hindsight Judi guessed that Kate’s atypical body language could be explained by the arrival of her youngest son Prince Louis the following year.
She claimed: “Another reason for the displays of tension, tiredness and wariness though might have been teased during a quote attributed to Kate on this tour.
“‘We will have to have more babies’ was in reference to some gifts of baby clothes she was given but Louis was born around nine months later, meaning Kate might have had another reason for what looked like some fluctuating moods and emotions here.”
Judi James previously spoke to Express.co.uk about Kate’s best bad moods, including a “frazzled” moment at Pippa’s wedding and a “small telling off” to William during their engagement interview.