Must admit I was surprised that Jennifer's Body bombed so bad. Her involvement in Transformers didn't have much of anything to do with its success. So she can't carry a film, and it's yet to be proven that she can garner interest as a hot co-star; replace Fox with any other it chick and Transformers would have done the same. Given her attitude and financial demands I could see her flaming out very soon, to no one's tears.
Unless that Jonah Hex movie does well, which I doubt