First images of Sienna Miller in GI Joe!

But beware the spoiler alert, soldier!

The first shots of Sienna Miller in character as The Baroness have climbed into your computer - but beware, they contain a pretty big spoiler.

We've cropped one of the shots to within an inch of its life (hence the graininess), so as not to ruin the twist - but if you want to see what's actually going on, go to JFX Online. They've got the shots of Sienna, and Channing Tatum as Duke. At ease.