Ahead of her appearance on the red carpet for the closing of the SXSW festival in London, Zawe Ashton has a very special announcement to make, shared exclusively with Vogue : she and her husband Tom Hiddleston are expecting their second child.

Given the momentous nature of the news, choosing the right look for the occasion was paramount. To reveal her growing baby bump, the glowing British actor will take to the red carpet in a resplendent, sleeveless sky-blue silk crepe gown with tumbling frill details, worn beneath a svelte, puddling cape in matching fabric.

Designed by Emilia Wickstead , the look’s poignancy derives not only from the significance of the occasion, but also from the fact that Ashton and the designer are longstanding collaborators and friends. “We met years ago a

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