Prince Harry Gets Big 'Happy Birthday' Greeting at Invictus Games

Prince Harry's celebrating his birthday this year with an intimate gathering ... of several thousand people at the Invictus Games, which turned into a massive "Happy Birthday" sing-along.

Harry and Meghan Markle were in the crowd at the Merkur Spiel-Arena in Düsseldorf Friday to watch Germany and Poland go at it in volleyball -- but when the game ended everyone's attention turned to the Duke of Sussex, who turns 39 today.

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Meghan and Harry lit up pretty quickly as the "Happy Birthday" song began, with Harry jokingly trying to deflect some of the attention he was getting. He even got another song from the Polish team before he asked to snap a pic with them.

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Not a bad way to celebrate his big day, especially because the event is so near and dear to Harry. He founded the Games in 2014, and each year since it brings together injured, sick, and wounded veterans to compete.

So, having the athletes and their families and friends wish him happy birthday has to hold more weight.

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