Kate Middleton and Chelsy Davy bonded over champagne as they watched boyfriends Princes William and Harry play polo.

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The pair – who were dressed in similar outfits of jeans tucked into knee-high boots, cropped jackets and large sunglasses – chatted and drank inside a marquee at Berkshire’s Coworth Park.

An onlooker said: “Kate and Chelsy really seemed to be getting along together as they watched their men competing on the polo field. They took time out from their drinking and talking to cheer on the princes.”

However, student Chelsy had to devote some of her time to studying and had brought along a big pile of papers. William and Harry were competing in the Audi polo match for the Um Bongo team.

After the match they collected medals from a tent, although Kate and Chelsy remained in the neighbouring marquee.

Last July, Kate and Chelsy accompanied their boyfriends to the memorial concert for their mother at Wembley Stadium. Kate rekindled her romance with William last year after a four-month break while Chelsy and Harry recently got back together after a brief split.