Sienna Miller, Hot Shot

Look out, photogs; Sienna Miller, whose dislike of the paparazzi is well-documented, is brushing up on her firearm skills.

Miller, seen here arriving at Heathrow Airport with boyfriend/Rod Stewart impersonatoractor Rhys Ifans, has told reporters that she's really enjoyed "kick[ing] some butt" while filming G.I. Joe--particularly, the opportunity to improve her aim.

"The best bit is that I'm doing that gun-twisting stuff," said Miller, who's playing the Baroness in the film. "I'm learning how to shoot properly, and it's all cool and a lot of fun."

No word on whether Miller is also developing her Kung-Fu Grip for the film.