Tom Cruise and Cameron Diaz were involved in a rather hairy stunt sequence in Vanilla Sky (the car crash sequence with Diaz behind the wheel), but in Knight & Day (opening Wednesday) the pair really pushed their bodies to the limit.  The fit and trim celebs didn’t mind kick butt and getting their butts kicked in Knight & Day, and they claim doing stunts for the film was actually rather fun!!  (CLICK ON THE MEDIA BAR BELOW TO HEAR TOM CRUISE)