London, July 28 : Brit actress Sienna Miller has admitted that she lacks "box office credibility".

The 27-year-old actress has made a number of flops including `Factory Girl' and `Interview'.

"If you want to make amazing, artistic films you've got to have some sort of box office credibility, which I don't," the Daily Star quoted her as telling Nylon magazine.

Meanwhile, Miller recently revealed that the costume she had to wear for `G. I. Joe - The Rise Of Cobra' often left her smelling like a "dead cow". (ANI)