The dress was Givenchy haute couture, and we’re still waiting for pictures (most likely sold for monster cash to a weekly tab). But the second dress, worn for the reception, was a party-ready minidress by Balmain designer Olivier Rousteing.

And from the 1/16 of the dress visible here on Rousteing's Instagram, it appears it was beaded.

View the image: http://instagram.com/p/obYKItwtCK#

(Thanks to E! for the deets.)