Kate Middleton's kiss to Prince William made more special after hidden detail is revealed

The Duchess congratulated her husband after his team's win

Royal fans are very rarely treated to a public kiss from the royals, but on Wednesday, the Duke and Duchess of Cambridge delighted onlookers as they were pictured giving each other a peck on the cheek at a charity polo match.

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Kate had accompanied her husband of 11 years, Prince William, to the Royal Charity Polo Cup staged in Berkshire, and following his team's victory, she greeted him with two kisses on the cheek before handing him an imitation Samurai warrior's helmet – from the Japanese sponsors of the tournament.

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The sweet moment between the two was thankfully captured by the photographers and celebrated by royal fans the world over – but many initially missed an incredible detail.

SEE: 24 Times Kate and William have shown PDAs during royal outings

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The royal couple's kiss came on a poignant day – International Kissing Day, which is celebrated every year on 6 July. The practice originated in the United Kingdom, and was adopted worldwide in the early 2000s.

The couple were also pictured with the arms around each other

Whilst out at the Castle Ground at Guards Polo Club, Prince William and Kate were also pictured with their arms wrapped around each other, something the couple have done at past polo matches – but rarely ever during official royal outings.

There is no royal protocol against public displays of affection, but Prince William and Kate often keep PDA moments to more low-key appearances, such as polo matches.

The couple celebrated 11 years of marriage in April

HELLO! magazine's royal editor Emily Nash has also previously said: "The Duke and Duchess are almost always seen in photographs taken during official engagements so they are at 'work' and it would be unprofessional to hold hands. They also need to shake hands with a huge number of people as they meet then, so aside from being on duty, it wouldn't be very practical!

"We know they are very affectionate and that sometimes comes across during more light-hearted moments, at sporting events or similar, but you wouldn't expect them to put that on show while in more formal situations."

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