Doesn't Rose Byrne look lovely in this little yellow dress by Marc by Marc Jacobs? Her dark tights and accessories cast a wintery look over the outfit, but her rosey complexion adds warmth to the ensemble.
Very convieneint too, that shes wearing Marc Jacobs to the premier of a film by Sofia. Do you think her guests feel obliged to wear her best friend's designs? They're so lovely that its more likely that they wore them out of choice.