Nancy and Kate. . . are they really the same person???

(Also known as Sort Out the Cloned Brunettes). Half of these photos are of Kate Middleton, and the other half of Paul McCartney's new 51-year-old-but-looks-30 heiress bride, Nancy Shevell.

Can you tell whom is whom, which is which, and (most importantly) why is why? I think I've lost track, myself.

(Confused? Me too. Does Kate have a twin?)

Oh. NOW I know. . .