Dakota Fanning and Kate Hudson.
Sean Hannity and Lou Costello
When I was at Dragon*Con, I went to a Firefly panel featuring Ron Glass. Evidently, he often got mistaken for Tim Reid.
He finally met Tim at some hollywood event and started to ask, “Hey, do people ever think you’re me?”
Tim interrupted him and said, “Man, all the time. I don’t even bother anymore, I just sign your damn name.”