One royal couple Charles could count on to join him for his first day at Royal Ascot as King was Zara and Mike Tindall.
Zara is a beloved niece of the monarch's and was seen politely curtsying before her uncle and kissing his cheek with Mike also warmly shaking the King's hand.
The royal couple are hugely affectionate not only with their relatives but with each other and have often been seen indulging in a spot of PDA.
One body language expert has said that this puts them on par with the Prince and Princess of Wales but there is one key difference, the Mirror reports.
Expert Darren Stanton explained: "Mike and Zara are incredibly close. It’s clear they are each other’s rocks.
"Their body language shows they are also very tactile with each other, which tells us there is huge trust between them.
"They have a very strong relationship, which is on par with Kate Middleton and Prince William. Mike and Zara often hug each other, hold hands and kiss
"They’re never afraid to show how they feel in public displays of affection. I can tell they’re very equally matched by their body language.
"Zara and Mike are both strong personalities, but their dynamic as a couple sees them balance each other out."
However, speaking on behalf of Betfair Slots, he pointed out: "Mike and Zara are similar to Kate and William in that they will put on a united front at these types of events. However, Mike and William are incredibly different characteristically.
"Mike is much more hands-on than William. You often see Mike being more physical and active.
"There is also more pressure placed on Kate and William to adhere to certain protocols, while Mike and Zara still have a certain pressure but not to the same level.
"They have a lot more freedom during engagements, and we see that through their relaxed gestures with each other."
Darren also noted that it was Mike who hung back and let his wife Zara shine at the Royal Ascot yesterday.
He added: "Mike and Zara both have strong personalities in their own right. It's clear the pair aren’t afraid to be themselves around each other and always appear supportive.
"During their appearance at Royal Ascot, Mike wasn’t afraid to let Zara take centre stage. He was seen stepping back a bit to let Zara go ahead and lead the way.
"That is him giving her the limelight. It shows his trust in her and the fact he cares a lot about giving her that independence, too."
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