Sienna goes brunette

Gone are the days of Sienna’s trademark golden locks and in comes the vampy brunette!

Don’t go running down to Superdrug to buy your dark hair dye just yet though, Sienna has only dyed her hair for her big role in GI Joe.

Sienna is playing the part of The Baroness and is having to beef up at the gym so her body fits the part.

I quite like Sienna with dark hair, what do you think??