Model Poppy Delevingne opted for a perfect summer look in a cream shift dress, flat sandals and quirky, round-framed sunnies
Billed by its host venue, Guards Polo Club, as 'the biggest polo day in the world', the Cartier International attracts a crowd of around 25,000, including royalty and Hollywood and rock stars.
A full programme of events includes, in the morning, the competition for the Golden Jubilee Trophy, followed by the Presentation Ceremony, and - after lunch - the Coronation Cup, followed by the Presentation Ceremony. Entertainment is laid on in the evening, finishing at 11pm.
Dress codes are smart casual - no jeans, trainers or sportswear, and gentlemen are requested to wear trousers, collared shirts and jackets in the restaurant.
Top American model Christie Brinkley might be 57-years-old, but she showed off the toned, slim body that would make women half her age envious, in this figure-hugging, purple plunging dress.
Model Amber Le Bon opted for a vintage-feel, flower-printed dress in pretty pastels
American actress Margot Stilley embraced the good weather with this zingy orange dress and leopard print wedges.
Czech model Petra Nemcova looked like butter wouldn't melt in this pretty, pale yellow wrap dress.
Actress Camilla Rutherford made a bold style statement in this printed shift dress.
Fashion designer Ben De Lisi finished his summer-ready look with a check-print blazer.
Lady Victoria Hervey and Andy Wong cut a colourful duo with their clashing ensembles.
Model Tasha De Vasconcelos looked good to go in a strapless minidress.
Made in Chelsea stars Rosie Fortescue and Millie Mackintosh.
Colour clash: Saskia Boxford (left) and friend