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The Duchess of Sussex holding her son Archie watched the Duchess of Cambridge as they attend the King Power Royal Charity Polo Day at Billingbear Polo Club, Wokingham, Berkshire. (Photo by Andrew Matthews/PA Images via Getty Images)

The Duchess of Sussex holding her son Archie watched the Duchess of Cambridge as they attend the King Power Royal Charity Polo Day at Billingbear Polo Club, Wokingham, Berkshire. (Photo by Andrew Matthews/PA Images via Getty Images)