The mum-of-three also wore Princess Diana's diamond and south sea pearl dangle earrings, with an equally exquisite diamond bracelet.
William, who is president of the British Academy, wore a simple black dinner suit and let his wife's outfit do all of the talking.
Kate, 37, channelled Hollywood glamour in a white one-shoulder gown with tulle flowers embroidered on one shoulder.
While members of the public whooped and cheered as the Duke and Duchess of Cambridge arrived outside the Royal Albert Hall in Kensington, London, the noise quickly fell to silence as the couple entered the auditorium. The tactic comes in handy whether Kate is trying to diffuse a toddler tantrum or William wants to share a moment with one of his kids during an event, and we can now add Anne Hathaway to the list of famous parents who have found the technique to be a good one.
They look just as attractive on Kate as they looked on Diana.
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Prince William and Kate got a little bit of adult time, away from the kiddos, last night!
The Duke and Duchess of Cambridge were making a return to the film awards, having attended previous ceremonies together.
Kate teamed the jewels with a gorgeous white Alexander McQueen dress with a floral motif.
Rami Malek won the best actor award for his portrayal of the late Freddie Mercury in Bohemian Rhapsody while Mahershala Ali was awarded best supporting actor for his role as a pianist in Green Book.