The two Game of Thrones actresses were joined by co-star Hannah Murray at the annual event.
FYI: Sophie is wearing a Carolina Herrera gown with a Jimmy Choo clutch and shoes. Maisie is wearing an Ermanno Scervino dress with a Jimmy Choo bag, Nicholas Kirkwood shoes, and Rue Gembon earrings, styled by Harriet Byczok.
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