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Prince William and Kate, Princess of Wales, appear to be as madly in love now as they were when they tied the knot in 2011.
And while the inner workings of their relationship are obviously private, the couple are totally happy to give the public an insight into their love.
Body language expert Judi James spoke exclusively to Express.co.uk about the specific traits the royal duo use to convey romance.
She stated: “William and Kate have been keeping royal fans, and each other, supplied with a stream of romantic gestures, tie-signs and touch rituals since they first married, but their technique seems to be driven by inclusion.
Judi claimed that the couple give the public a “peek at the private nature of their romance” through the “key trait” of proximity.
She referenced a sweet snap of William nuzzling into the back of Kate’s head as the pair handed out water to runners at the Virgin Money London Marathon in 2017.
Judi said: “When they enter one another’s personal space on tours and visits, William in particular seems to be unable to avoid breaking what often seems to be his own rules of non-tactile public behaviour and intensifying the romance of the moment via gestures like this little nuzzling kiss of her hair.
“The gestures are often more for him than her as she might not even be aware at that moment but this is a trait many couples will share.
“Proximity will suddenly bombard the senses, meaning William will smell Kate’s perfume or her hair as he suddenly moves into her close orbit, making him motivated by the desire to get even closer and involve touch, too.”
Another “key trait” the pair used to convey romance is touch, according to Judi, for example Kate’s hand on her husband’s thigh even at “more formal events”.