Kate Middleton just wore this £40 Zara dress, and we need it

It's this year's summer wardrobe staple

Our love for Zara never falters, and it seems neither does Kate Middleton's.

The Duchess of Cambridge was spotted wearing an off-shoulder embroidered summer dress from the high street retailer at the Houghton horse trials on Sunday.

Currently on maternity leave following the birth of her third child, Prince Louis, Kate spent the day in Norfolk with her eldest two children, George and Charlotte. Apparently, the family blended in with the rest of the general public and pretty much went unnoticed.

'We were sitting on the bench having something to eat and I noticed this beautiful woman in a blue dress who had two kids with her and I suddenly realised who it was,' Jack Schmollmann told the Daily Mail.

'I think other people noticed them but not everybody because they did their best to blend in and were just going about their daily lives. They were having a nice family day out, eating ice creams and sitting in the sunshine.'

As well as the striped sun dress, below, the duchess reportedly sported a bag by Little Makes Big and earrings by Catherine Zoraida.

Flocked Print Dress, £39.95, Zara

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Unsurprisingly, the dress is now out of stock online, but you can keep checking to see when it's back – or try your luck in-store.

The Kate Middleton effect strikes again.