First Image of Sienna Miller As Baroness From G.I. Joe

IGN has scored the first photo of Sienna Miller as the villainess Baroness in G.I. Joe!

And here's more info on Baroness.

The spoiled offspring of wealthy European aristocrats, the Baroness graduated from student radicalism into international sabotage and finally into the ranks of COBRA. She was severely burned during a COBRA night attack operation and has had extensive plastic surgery. Rumor has it that she is the only one who knows the true identity of Destro (with whom she is romantically involved).