When doing this, body language expert Judi James suggested they have shown increasing romantic affect.
She said: “Although Kate and William’s PDAs have been rare and subtle, their even-handed mirroring traits and their subtler tie-signs and fun competitiveness have shown more dimensions in terms of romantic affection.
“The Cambridge’s PDAs have increased with time, but their initial masking was probably more down to William’s passionate desire to avoid the kind of soap opera publicity that surrounded his parent’s marriage.”
Showing affection is rare for many royals and Judi explained it is unusual for couples who have been together for as many years as the Cambridges.
“For a long-term married couple, their connection signals make them appear even more openly romantic together than what is usual,” the expert told Express.co.uk.
“In public, William keeps close to Kate and often guides her gently in front of him, showing off he is proud of his wife with rare public affection.”
Since marrying Prince William, Kate has become a popular member of the Royal Family in her own right.
The Duke of Cambridge’s recent body language with his wife could suggest he is proud of her, Judi continued.
She stated: “William’s hand gestures suggest he gently steers Kate to walk ahead with a sense of pride and admiration.
“His tactile behaviour includes another affectionate back-touch with a splayed hand.”
While Prince William shows “pride” with his wife, the expert suggested both royals have displayed genuine happiness and affection.
Judi stated: “Kate’s excited eye expression and her wide, dimpled smile suggest genuine, congruent pleasure at being in her husband’s company.
“His beaming and at times slightly shy smile plus his softened features do suggest he’s very happily in love.”
Judi explained the Duke and Duchess of Cambridge seem to be in sync and they appear as a royal “power couple”.
“It’s their facial expressions as well as their mirroring and their intense and mutual attention rituals with one another that suggest they are presenting as romantic royals as well,” she continued.
“The couple’s body language does seem to define them as a true royal power couple.”