January Jones both hit the LA premiere of their new thriller, Unknown, last night - in very different looks.
January Jones opted for an edgier asymmetrical dress by Alexander McQueen, which featured a gold bust and cascading military buttons.
So which star shone the brightest? Although we love both, Diane's little white sparkler is fresh and sexy, and we have to give the gong to her.
What do you think? Let us know below...