Body language expert Judi James analysed the Cambridges' appearances next to Prince Harry and Meghan Markle and compared the couples' non-verbal communication.
The body language expert claimed the Prince and Princess of Wales appeared more formal than ever this week "as they share some of Charles’s duties and responsibilities".
The expert explained that in comparison, Harry and Meghan are much more natural and spontaneous with gestures like "Meghan’s hair-flicking".
The Duchess of Sussex has been defended for her recent actions as one TV host praised Meghan for handling a "really threatening environment" when she appeared alongside William and Kate in public.
It is rare to see royals showing public affection but the Princess of Wales sometimes uses subtle signals to communicate certain things to her husband.
The body language expert said the arms down gesture is "practical as well as part of their charisma" and similar to how Queen Elizabeth and Prince Philip used to behave in public
Meanwhile, Meghan and Harry always hold hands in public, which is "a rather youthful signal of love with hints of some mutual dependency," the body language expert claimed
The Prince and Princess of Wales, Prince Harry and Meghan Markle will be seen together once again on Monday, September 19, at the Queen's funeral.