Two delicate, beautiful English roses who both work on the big screen, at first glance there's no telling Keira Knightley and Daisy Ridley apart. They even have the same smile and cheekbones; or at least them seem to on the rare occasions when we see Knightley smile! When Ridley was cast in her breakthrough 'Star Wars' role, people probably congratulated Knightley. That would have been pretty confusing for Knightley, who was actually in the 'Star Wars' prequels some ten years earlier.
Whereas most celebrities on this list at least say they're fine with being mixed up with someone else, Ridley is less happy about it. That might have something to do with the fact that Knightley is quite a lot older than her. Nobody in their mid-twenties wants to be mistaken for someone who's in their mid-thirties.