Actually thats pretty interesting. There are quite a few people who make a living impersonating celebs, not just in a comical way.
Recently David and Victoria (Posh spice) Beckham came down to Australia...although at the same time the spice girls were performing in london. Celebrity 'stand-ins' are used for public appearances, so Posh could be in oz AND in london, and nobody would be any wiser.
It is sneaky, but i guess the works there if people need it. Now if i could just find someone who looks like me, and make them go to work for me while I go to the beach, i'd be all set!
