Britain's Prince Harry did the almost impossible -- he recruited the very private Queen Elizabeth - his grandmother - for a promo video.

It's for a good cause...

... the Invictus Games, celebrating the athleticism of disabled military veterans.

And he's doing it with help from the Obamas.

The prince and First Lady are big supporters of the games, which start in Orlando, Florida on May 8.

More details about the games can be found here.

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