I thought it was Marchesa at first, but then it was being identified as Oscar de la Renta and then L'Wren Scott was being thrown around. To be fair, the dress looks like it could've been any one of them!Her dress is Marchesa.

Not crazy about the premeire dress, alot of L'wren Scott gowns have been looking very showgirl lately, the feathers are too much if they werent on top I think it wouldve been much better. Hope we see her in some color just not b&w.