The Prince and Princess of Wales were caught exchanging "flirtatious" looks during the annual Commonwealth Day celebrations, with Kate making a telling "gesture of happiness", a body language expert believes.
The couple joined the rest of the royal family for the annual church service at Westminster Abbey on Monday afternoon, the first since the Queen's death and King Charles took the throne.
There were lots of sweet moments between the senior members of the family when they arrived at the event, exchanging small talk before the official procession to take their seats.
But body language expert Judi James believes Kate and William gave the most away with a series of fun and happy gestures during the hour-long service.
She tells The Mirror: "[The Prince and Princess of Wales] were spotted exchanging some grins that were fond bordering on the flirtatious during the service.
"At one point Kate leant over to point to the place William should have been on his song sheet and he replied with a rather sweet suppressed smile, followed by a small bounce on his heels to signal a moment of happiness. Kate was also seen chatting to William during one of the musical numbers and his grin in reply looked equally cheeky."
Judi believes it was actually Sophie, the Duchess of Edinburgh, who set the tone after sharing a "telling and very sweet PDA" with her father-in-law, King Charles.
She explains: "The most telling and very sweet PDA was between Charles and Sophie. Whether it was the upgrade to Duke and Duchess of Edinburgh or maybe just a response to Charles’s slightly impatient-looking dithering as he waited to get on with the procession, but Sophie leant right in to give Charles a very playful shoulder-bump greeting, along with a very meaningful grin.
"It was probably the first glimpse of a gesture like this at a formal public event like this and as an ice-breaker it seemed to set the tone for the new Prince and Princess of Wales."
However Judi believes Camilla's body language was a strong contrast to the rest of the family, believing she showed signs of being anxious.
She explains: "Charles’s air of impatience might have been prompted by what went on outside the Abbey. Being greeted by jeers from the crowd from people carrying anti-monarchy banners didn’t rattle the King but it did seem to startle Camilla. While Charles stopped to enjoy the performance of a haka, Camilla walked straight past despite the fact he seemed to turn to expect to enjoy it with her.
"Camilla was also clearly worried about the wind taking her hat and messing her hair but those are not the normal concerns for royal women. Buffeted by the same strong wind, Kate just placed one hand to steady her hat and Anne walked through without as much as a blink of concern.
"Camilla was still troubled by the time she got inside the venue, miming as such to Sophie and patting and fiddling with her hair throughout her appearance.
"Camilla looked intensely nervous here at what might have been a rather relaxed induction into life as a new Queen. Her hands shook as she held her order of service and she barely sang the words to the songs. She chatted to William and Kate on the way and seemed to ignore Charles, who stepped across to grab her by the arm and motion her to her spot for their walk up the aisle. On the way out she spoke to Charles but he seemed to ignore her, turning his head away to acknowledge the audience instead."