Britain's Princes William and Harry will join forces to play polo for charity this weekend.
The royal brothers are to team up for the Audi Polo Challenge in support of four different aid organisations, Sentebale, Well Child, The Royal Marsden and Tusk.
A series of tweets on the official Kensington Palace Twitter read: "The Duke & Prince Harry will join forces again this summer to play polo in support of a number of their charities
"This weekend TRH will play in the #AudiPoloChallenge, in support of @Sentebale @tusk_org @royalmarsden & @WellChild"
Kensington Palace also reminded royal fans that the siblings have raised nearly £10 million for charitable causes since 2007.
They tweeted: "The Princes have raised over £9.5m for charitable causes to date since 2007, and this summer's matches will see the total pass the £10m mark"
William, 33, and Harry, 31, are big fans of polo, but their games don't always go according to plan.
Last year, Harry was injured while competing in the same tournament in aid of Centre Point, Child Bereavement UK and WellChild.
He appeared to be struggling with a bad back and was attended to by a physiotherapist on the pitch before doing a number of vigorous stretching exercises and remounting his horse.
Fortunately, the prince was quick to recover and was later spotted rubbing shoulders with a host of A-list guests including 'Thor' star Chris Hemsworth, actors Tom Hardy and Samuel L. Jackson, and singer Sophie Ellis Bextor.
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