Kate Middleton, Princess of Wales, has been spotted on countless occasions in a certain pair of espadrille wedges, wearing them with everything from wide-leg jeans to flowing midi dresses for all kinds of occasions. Now, her little sister Pippa Middleton has followed suit, choosing to sport the comfy-looking shoes to the Silverstone Grand Prix over the weekend.

The wedges in question are Castaner's Carina self-tie canvas wedge espadrilles, £120 on Selfridges. Word has gotten around about Pippa's shoe choice because there's now limited stock in many of the popular sizes. So, if you're keen to get a pair of your own, we'd suggest acting fast.

As we say, Kate is also a big fan of this exact style of wedge, having worn them on many occasions, including the Chelsea Flower Show and Henley Royal Regatta. It's also easy to see why the Castaner Carina shoesare a top Royal pick for casual and more dressy events. The espadrilles are made from 100% canvas and feature self-tie fastenings, closed round toes, woven patterns on the sides, all-over canvas texture and, most crucially, a comfy low wedge heel that measures 2.3". Essentially, it's the perfect shoe choice for days when you're spending a lot of time on your feet but you also still want to look polished.

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If you love a bargain, La Redoute is also offering a version of the Carine canvas wedges for £64.99in a slightly darker colourway. However, stock is dwindling fast.

If you're interested in the rest of Pippa's F1 outfit details, she also carried a new accessory to the racing event: Emmy London's Mabel Bag in the tan leather colourway, £595. As for her dress, it's from Usisi Sister and is priced at £415. Currently, stock is still available in sizes S through to XL. Her jacket, which matches perfectly with the bag and heels, is an old-season Sezane piece.

Although the Castaner wedgesaren’t breaking the bank by royal standards, the £120 price tag on Selfridges may be a little steep still. If this is the case, we've managed to track down an almost identical pair at Crew Clothing which will save you some pennies, with the Faith Classic Heeled Espadrillepriced at a much for budget-friendly £60.

The Faith sandals mirror Princess Kate’s thanks to their espadrille style, with a jute wedge heel and suede closed toes. The suede is made from real leather and comes in a range of three colours, including beige, pale pink and black.

Alternatively, we also love New Look's versions, the Off White Faux Leather Woven Closed Toe Wedge Sandals, £35.99. Their adjustable strap and wedge heel ensure a comfortable fit, while the raffia trim and ribbon tie detailing around the ankles give the shoes an elevated feel.