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Published 08:09 3 May 2016 BST
Updated 08:21 3 May 2016 BST

The whole dress illuminated when it was dark. It's been dubbed the 'Galactic Cinderella' and was made from fiber optic woven organza.
Just look at it.#clairedanes #zacposen #metgala A photo posted by @zacposen on
Lead image via zacposen.#clairedanes #zacposen #metgala A photo posted by @zacposen on