Hands down I go with Jennifer Connelly. Not even close.

Seems that both are in an upcoming film He's Just Not That Into You and that they might not be the best of friends. 

“Word is, Aniston threatened to pull out if Jennifer was part of the cover,” says an insider familiar with the movie's shoot. “It was all about getting Jennifer Aniston front and center and looking as sexy as possible.”
While Aniston’s rep denies that there’s any discord between the actresses, they just didn’t hit it off, says the insider: “There was no camaraderie between those two whatsoever. They didn’t seem like friends in the slightest.”