LOS ANGELES — Sienna Miller has endured her fair share of bad press in recent time, most notably during her romance last summer with the married Balthazar Getty. But the British actress wasn't worried about mending her public image when she recently traveled on a dangerous mission to war-torn Congo.

"If I'd done it for publicity, I would have taken a photographer," the 27-year-old star tells Nylon magazine for its August issue. "I'm not just lending my name to it.  We went to a war zone, we lived in camps.  I would like to see those [detractors] doing the journey we did."

"I basically realized that I was so resentful for so long about the state of my celebrity, but I wanted to turn it around and do something good," she added.

Even if Miller wanted to publicize her good deed, she most likely would have turned away the paparazzi. That's because Miller is still smarting from the snapper who snuck onto the set of her upcoming movie "Hippie Hippie Shake" to get nude shots of her as she filmed a skinny-dipping scene.

"Me, full-frontal naked. I don't want to be naked on the cover of a Sunday newspaper! I don't!" Miller said of the photo published in the U.K.'s News of the World. "I don't want people analyzing the shape of my muff!"

One bit of publicity that Miller is looking forward to is her upcoming starring role in the most commercial film of her career, "G.I. Joe: The Rise of Cobra."

"It's really exciting to be in a film that people actually want to go and see! I was having to pay people to see my movies!" Miller tells the mag. "If you want to make amazing, artistic films, you've got to have some sort of box office credibility, which I don't have."