Jeff Goldblum, who was also in Wicked, sported a floral shirt and real flowers on his white dinner jacket, and was accompanied by wife Emilie Livingston.
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Rachel Zegler, who will soon be seen in a remake of Snow White, wore a Dior gown.
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British actress Raffey Cassidy, who appears in The Brutalist, had a flowing gown tied with a giant bow.
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British actress Yasmin Finney, known for Heartstopper and Doctor Who, was framed by tall feathers attached to her dress.
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UK singer Raye, resplendent in red, will perform at the ceremony.
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Actor and comedian Bowen Yang, who announced the Oscar nominations in January, opeted for floral embellishments on his jacket along with a frilled pink shirt.
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Wallace and Gromit joined the Hollywood stars on the red carpet after Vengeance Most Fowl was nominated for best animated film – they were accompanied by creator Nick Park (left), producer Richard Beek (centre) and co-director Merlin Crossingham.
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Four-time Oscars host Whoopi Goldberg is back as an award presenter this year.
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Grammy-nominated singer Omar Apollo wore a netted veil along with black-and-white spotted shirt and scarf.
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Edward Norton is nominated for best supporting actor for A Complete Unknown.
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Chicken Shop Date host Amelia Dimoldenberg is the official Oscars social media correspondent for the second year.
By Ian Youngs, Scarlett Harris and Matthew Tucker.