Meghan Marklewas all smiles as she cheered onPrince HarryandPrince Williamat the Audi Polo Challenge in Ascot, England, on Saturday.

Meghan paired her dress with a pair ofGrear leather sandals from Sarah FlintNY, a pair of sunglasses anda white-and-black Madewell x Biltmore Panama hat, which is also sold out.

Accompanying her to the Coworth Park Polo Club were friends Serena Williams and her husbandAlexis Ohanian, who were both in attendance at Meghan and Harry’sroyal weddingin May.

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Harry and his older brother William delighted fans as they took to the field on Saturday, just one day before their late motherPrincess Diana‘s birthday, to play for their favorite charities.

The royal brothers both wore white polo shirts with stripes on the side, which they paired with white pants and boots.

William’s wifeKate Middletonand their children were not spotted at the event.

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The annual event likely holds a special place in Meghan and Harry’s hearts: Their appearance at the game last year was the first time the coupleattended a public event together, and they marked the milestone with a kiss.

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Of course, this has been quite the busy week for Meghan and Harry!

On Tuesday, the royal couple joinedQueen Elizabethfor aparty at Buckingham Palace, during which Meghan had aminor slip-up with royal posture protocol.

After expertlydemonstrating the “duchess slant”at numerous royal events in the past, Meghan seemed to innocently forget the pose (at official engagements royal women are supposed to cross their legs at the ankles or put both legs off to the side to maintain poise and posture) when taking her seat beside Harry and the Queen.

At first she accidentally crossed her legs, but she quickly recovered, uncrossing her legs at the knee and slanting them to the side.

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Harry — who just returned to the U.K. this week following aprivate visit to Lesotho, Africa,for his charitySentebale— and Meghan will tour the Commonwealth countries of Australia, New Zealand, Fiji and Tonga this fall, the palaceconfirmed recently.

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source: people.com