Edit: also, not an example of a doppelgänger (exactly) but this is totally true:
Daisy Ridley is like a cross of Portman and Knightley.
Speaking of which, Portman and Knightley both played Amidala in Star Wars Episode I as well.
This is why a lot of people speculate that Ridley is a Skywalker...
Daisy..................................... Keira.................................... Natalie