The BAFTA winner has just been cast by the Moulin Rouge for his latest project, a new adaptation of The Great Gatsby.
We won't be too harsh on Ms Mulligan's unkempt dark hair - after all, the poor girl was just having a quiet night out. But we do take exception to her granny-style flesh tone tight. Not cool Ms Mulligan, just not cool.
Thinking about taking Carey's lead? Be inspried by our celebrity brunette gallery.