Hollywood actress Sienna Miller is apprehensive about the release of her upcoming movie G.I. Joe, as she says her performance is "not the best acting" she's done.
The British star plays a leather-clad spy The Baroness in the film and insists it was a challenge to move from dramas such as Factory Girl and The Edge of Love to an all-action role, reports imdb.com.
"G.I. Joe is not going to be the best acting work I've ever done. The guys I'm fighting are all really tall and I'm not. I have to kick a lot of them in the head, so just learning to kick very high was a challenge. Looking like you're a good fighter is hard," she said.
The 27-year-old admits her performance was also hindered by her costume - a black leather catsuit.
"I won't be wearing one again. Squeezing myself into that with the aid of talcum powder every day for five months was more than enough. I could barely move in it," she said.