It seems one of the disadvantages of always wearing sunglasses is that it makes it a lot easier for somebody to impersonate you. Even if you're incredibly famous. That's how an impostor managed to party it up at Cannes, while celebrities were excitedly tweeting about meeting Psy. 

Naomie Harris, pictured above, tweeted "Me and @psy_oppa at the @Choppard party in #Cannes!! Xx" So many exclamation points wasted.  Psy graciously let the the partygoers know they'd been had via tweet:

 

Must have been pretty embarrassing for everyone involved. Everyone except the impostor, who managed to escape unscathed. Well done, sir.