This is where you’ve seen Kate’s blue polka dot dress before

As always, Kate, the Duchess of Cambridge put her best fashion foot forward during a public appearance at the D-Day exhibition at Bletchley Park.

Styled to perfection with her signature waves and subtle pearl earrings, Kate looked every inch a princess – but if you thought her gorgeous Alessandra Rich dress felt rather familiar, you’d be absolutely correct.

Kate polka dot dress
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Back in November, the world’s heart was warmed as Kensington Palace shared a set of gorgeous pictures of Prince Charles and his family to mark the occasion of his 70th birthday.

The shots showed the Prince of Wales with his wife Camilla, his sons Princes William and Harry, their wives Kate and Meghan, and his grandchildren Prince George, Princess Charlotte and Prince Louis, posing happily for royal photographer Chris Jackson, who has worked closely with the family for 15 years. And you’ve guessed it – there’s that dress once again.

Kate Middleton polka dot dress
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For the most part, all eyes on the portrait were on the adorable little ones – in particular, as the snap provided our clearest look at little Louis to date – but royal watchers also noticed a lovely tribute paid in the picture through mum-of-three Kate’s outfit.

The blue-and-white polka dot dress, which boasts an oversized Peter Pan collar and white buttons down the front, bears a striking resemblance to a dress worn by her husband William’s mother, the late Princess Diana, back in 1985.

In addition, HELLO! magazine reported that Kate also wore Diana’s sapphire earrings for the birthday photograph, in yet another subtle nod to the absent loved one.

Kate Middleton's polka dot dress Princess Diana
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Speaking to GQ previously, Prince William expressed his sadness that his mother would never know the family he and Kate had built together, admitting: ‘I would like to have had her advice. I would love her to have met Catherine and to have seen the children grow up. It makes me sad that she won’t, that they will never know her.’

‘I could not do my job without the stability of the family,’ he added. ‘Stability at home is so important to me. I want to bring up my children in a happy, stable, secure world, and that is so important to both of us as parents.’