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THE DUCHESS of Cambridge chose a red Jenny Packham dress with a white lace collar when she  appeared on the steps of the Lindo Wing with the newborn baby Prince Louis on Monday.

The choice was both patriotic - a nod to the English flag on St George's Day - and a tribute to the late Princess Diana, who wore similar colours to introduce Prince Harry to the world.

 Kate's bespoke maternity gown shows similarities to the one in Rosemary's Baby
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Kate's bespoke maternity gown shows similarities to the one in Rosemary's BabyCredit: PA:Empics Entertainment

But some film fans quickly spotted the similarities to the dress worn by actress Mia Farrow in the classic horror movie Rosemary's Baby.

They took to Twitter to share the uncanny resemblance with one writing: "Kate Middleton rocking the same dress as Rosemary from Rosemary's Baby is definitely not discomforting at all..."

The deep red is a similar colour but the floral white lace collar is identical to Mia's.

The outfit is worn by Rosemary in a poignant scene where she feels her baby move for the first time after difficulties in her early pregnancy.

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Rosemary wears a similar red dress with white lace collar in the horror film

 Kate is likely not a fan of the film and had no idea her outfit had a stunt double
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Kate is likely not a fan of the film and had no idea her outfit had a stunt doubleCredit: AFP and licsensors

 

The 1968 movie stars Mia Farrow as a new mum who gives birth to the son of the devil after being drugged and abused in an evil cult ritual.

Directed by Roman Polanski, is is widely hailed as one of the best horror films ever written.

Check out how when Princess Charlotte was born in 2015, Kate opted for a buttercup print silk shift dress, also by Jenny Packham, for the event.

See all the tribute looks that Kate has done for Princess Diana over the years, from tiaras to THAT red dress.