It's the latest look in a slew of winning promo ensembles for Clarke curated by stylist Petra Flannery.
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For the New York premiere of the festive film, she shone in a sequinned Valentino spring/summer 2020 dress. Committed to the Quality Street hue, a pair of matching drop earrings, shoes and manicure finished the look.
Though she wasn't the only silver screen star to celebrate the Christmas countdown, as the 33-year-old was joined on the red carpet by co-star Henry Golding.
The actor tackled all of the festive trends in one fell swoop in a velvet blazer, roll neck and tartan trousers by Ralph Lauren.
The newly-released Christmas flick sees Clarke take on the lead role of Kate, a Londoner who continues to make regrettable decisions as she tries to follow her dreams of becoming a singer - while trying to hold down a job at a year-round Christmas store.
But when Tom, played by Henry Golding, comes into her life, Kate's luck soon starts to "look up".
Last Christmas is in cinemas now.