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Prince Harry, Prince William and Catherine, Duchess of Cambridge, are regularly photographed out and about at events. But this might be the sweetest event theyve ever hosted.

The three held a tea party at Buckingham Palace honoring children who have had a parent die serving in the armed forces. According to the Kensington Royal Instagram (an account representing the activities of the Duke and Duchess of Cambridge and Prince Harry), the three invited 850 children and their guardians to this Party at the Palace.The kids participated in fun events alongside the royals, all for a good cause.

Today was organized to celebrate you guys, Prince Harry said at the event, via Elle UK. Were here to remind you that we as a family, and as a nation will never, ever forget the sacrifices that all of you here have made. We wanted to give you an opportunity to know that you are part of, sadly, a very large group of fantastic people.

He added, The three of us, and all of our family, wanted to thank you so, so much for everything youve done. I can assure you that Buckingham Palace gardens have not seen this much fun, ever.

Below are some adorable photos of the event:

POOL New / Reuters

WPA Pool via Getty Images

WPA Pool via Getty Images

POOL New / Reuters

POOL New / Reuters

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The Royals Hosted A Tea Party For The Most Heartwarming Reason ... - HuffPost