The last I heard Keaton was 5'10 which is the same height as the guy that's playing a 6'8, 400 pound villain.
Michelle is 5'7 plus she was wearing high heels as Catwoman. Regardless of that Batman looked to be at least two inches taller. It's not necessarily the best example because her knees are slightly bent and Batman's head is slightly tilted down but the height difference was obvious in the film.
