Kate Middleton, Prince William, Prince Harry and Meghan Markle make up what is called "fab four", the next generation of royals.
A body language expert analyzed the two couples in the same scenario and gave her a professional opinion on how they differ.
Judi James looked at the images of both couples kissing at the polo while the princes received prizes. He said that while the kisses are very different, this may have been inspired by the same women, the late Princess Diana.
"Both guys grew up with an extremely loving and tactile role model in Diana, but each of them could have subtracted completely different lessons that they now apply to their exposures on married life," Judi said.
According to the body language expert, spontaneous body language and risk-taking behaviors are not a feature of the public profile of William or Kate.
He said: "William has always been appropriately cautious about a man who is the heir to the throne and his non-verbal behavior since his boys often report more introverted traits, in direct contrast to his younger, extrovert brother and risky, Harry.
"Harry seems happy to imitate his mother's characteristic of public displays of hugs and affections that William could have grown more aware of the potential risks involved."
Kate Middleton and the kiss of Prince William
William avoids the "signals of the real soap opera that made Diana the victim of too much attention from the press," said Judi.
"His kiss with Kate at the pole is appropriately prudent and free from any manifestation of open emotion beyond general happiness.
"He leans for his kiss rather than to touch the torsos and also holds the prize up close to the ribs to ensure that the spatial gap between them is more the variety" friendship "rather than" lovers "."
However, his wife Kate, the Duchess of Cambridge, seems to have the same attitude as her husband, with the couple perfectly in tune.
"Kate responds in a complementary way with her hand firmly but politely resting on her shoulder.
"We have to look at the finer signs to see the evidence of love that obviously exists between two of them," said Judi.
"Their mirrored smiles with apple-shaped Kate's cheeks show the real fun and joy of being together and Kate seems to be chatting while William smiles happily."
Meghan Markle and the kiss of Prince Harry
This couple chooses to kiss each other on the lips, rather than on the cheek like Prince William and Kate Middleton do.
"For Harry and Meghan although there's a much more" famous "approach to their PDAs," said Judi.
"They have been profoundly tactile since we first saw them together with the Invictus and Harry games, very spontaneous and relaxed, and clearly found Meghan's traits of tactile and open performances of love and affection perfectly complementary.
"When he shows signs of detention, he will always give him an opportunity to be more open, as it seems here in this very intimate and rather sexy kiss to polo.
"The couple allows himself to flirt his eyes, but then performs a passionate kiss of lips with Meghan's head tilted backwards as he leans forward to add to the love story" .
Who is Meghan Markle? Quick profile
Meghan Markle was born Rachel Meghan Markle, August 4, 1961 from parents Doria Ragland and father Thomas Markle.
His father had previously been married to Roslyn Loveless and Meghan has two older brothers – sister Samantha Markle and brother Thomas Markle Junior.
The first television appearance of Meghan in the United States occurred in an episode of the medical drama General Hospital in 2002.
She later moved on to roles in CSI, Without a Trace and Castle along with parts in Hollywood films like Get It to the Greek, Remember Me and Horrible Bosses.
Meghan was also a "briefcase" on Deal or No Deal – but her most famous role was that of Rachel Zane in the legal film Suits, launched in 2011.
It was written in the final of the seventh series when her character got married, which aired in April 2018 – just before she married alone.
Charity and humanitarian work
Meghan Markle's career on television has gone hand in hand with her support for causes close to her heart.
He wrote about the stigma on menstrual health in an article for Time magazine and was Global Ambassador for World Vision Canada – with whom he traveled to Rwanda for the clean water charity campaign.
And her commitment to gender equality saw her work with the UN – receiving a standing ovation in 2015 for her speech on International Women's Day.
In September 2011, he married film producer Trevor Engelson, who began dating in 2004.
But the couple divorced two years later, in August 2013, citing an irreconcilable difference.
He had a relationship with celebrity chef Cory Vitiello for almost two years, before breaking the contract in 2016, but the two remain good friends.
And in June 2016, he met Prince Harry in a blind date organized by a mutual friend.
Their relationship began in October of that year and just over a year later, on November 27, 2017, the couple announced their engagement.
They married May 19, 2018 in the chapel of St. George in Windsor Castle.
The legacy of Meghan
Some have claimed that Meghan Markle is the first mixed race member of the royal family.
Historians are still arguing about Queen Charlotte, wife of King George III.
But Meghan will be the first real to openly embrace a mixed race legacy.
He wrote of the difficulties of being a biracial actress in Hollywood, claiming he was not black enough for some roles and not white enough for others.