Kate Middleton and Prince William said "I do" on April 29, 2011. During recent outings, a body language expert suggested the couple have changed in public since the wedding.
The royals met around 10 years before they tied the knot at Westminster Abbey in London.
Like many members of the Royal Family, the Duke and Duchess of Cambridge will mostly stay tight lipped on their relationship.
They will, however, often appear together with their family or to carry out official royal engagements.
When doing so, their body language could indicate a recent change in their relationship.
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© GETTYKate Middleton: Prince William wedding
Body language expert Judi James explained they may have ditched formalities and shown the more "playful" side of their relationship.
She said: "They have always been a hilariously and openly competitive couple, especially when they're pitted against one another in any sport and they have always been the most relaxed and vivacious-looking when doing so.
"Recent poses seem to take that playfulness to a new level.
"Kate is what looks like helpless with laughter while a grinning and beaming William signals sharing and approval via some congruent signals of glee as he stands beside her."DON'T MISSMorrisons is banning all plastic bags from stores [DETAILS]Tesco: 'Psychological trick' gets Britons to 'throw their money away' [INSIGHT]Kate Middleton's body language suggests she was influenced by Sophie [COMMENT]
Kate is set to be Queen Consort one day, as Prince William is second in line to the British throne.
Because of this, it is no surprise why the royals may have appeared wary of the public's gaze when out before.
During more recent engagements, however, Judi claimed the royal couple seem more relaxed in public.
She stated: "Kate's body language has become so much more relaxed recently. © GETTYKate Middleton: Prince William relationship
"She appears much less wary about being the centre of attention when she's out with her husband.
"Her perfect smile is often swapped for the kind of open-mouthed, face-wrinkled laughter of what looks like genuine humour and delight and this is one of the best examples of that body language ritual."
The Duke and Duchess of Cambridge have carried out engagements together since they married in 2011.
The expert suggested Prince William also used to be more "serious" during previous outings.
Now, like his wife, the future King seems more relaxed during their outings. © EXPRESSKate Middleton: Royal Family relationship
Judi concluded: "William has often looked more serious and formal.
"He adopts his signature fig-leaf pose with hands in a self-conscious barrier gesture in front of his pelvis.
"But now he is not only laughing with his wife, he also seems to be winding her up here too, and that sense of playfulness suggests very strong bonds.
"At one point he even places one hand in front of his face to shield it from public view as he seems to whisper to her privately.
"The way he claps her suggests more shared fun as he wears his widest grin to suggest total enjoyment of the moment."