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Duchess Kate's dress has already been identified as Alessandra Rich's Polka-Dot Silk Dress which happens to currently be on sale for $952.

Her dress is originally $1588, and it's from the designer label's AW19 lookbook.

The Duke and Duchess of Cambridge have joined forces with Mary Berry for a festive TV special #ABerryRoyalChristmas. @emynash has all the details here: https://t.co/KbI2bi7w6d

— Danielle Stacey (@daniellestacey1) November 30, 2019

The Duke and Duchess of Cambridge appeared in another photo on Twitter wearing aprons alongside Berry who is a former judge on \"The Great British Bake Off.\"

The Christmas special is slated to air on Dec. 16 at 8:30 p.m. on BBC One.

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