This is officially the wedding guest dress of the year after shoppers snap up Pippa Middleton's gown in a frenzy

When Kate Middleton wears a pretty dress, we can pretty much guarantee it’s going to sell out online within hours (if not minutes), but it turns out her sister, Pippa Middleton, is also pretty influential in the dress stakes.

Pippa stepped out at Lady Gabriella Windsor and Thomas Kingston’s wedding at Windsor Castle this weekend in a gorgeous sky blue Kate Spade New York Flower Devore Dress, costing £695, and she may have just trumped best dressed wedding guest of the year.

Getty Images

The dress, with its cute clover print, draped neckline and puffed sleeves, teamed with the fact that it elegantly nips in at the waist, isn’t too clingy and has a flattering midi length, which clearly made it the best damn perfect wedding guest dress of the season. According to the brand’s website, the dress, “walked the runway at out spring 2019 fashion show.”

It turns out that quite a few people agreed it was a hit because in less than a week, the dress has almost completely sold out on the Kate Spade NY website (as we write this there are still some UK 6 sizes left - you better be quick).

Pippa, who is no stranger to wedding guest dressing, gave it some extra chic-ness by teaming it with a blue velvet headband from Jess Collett and some classic blue suede pointed pumps.

It’s not the first time the Duchess of Cambridge’s sister has worn the label, Pippa has been spotted wearing several pieces by Kate Spade while out and about, including on her honeymoon. It’s deffo one of her go-tos.

If you’re too late to get your hands on this one, see our edit of more of this year’s best wedding guest dresses below...