She loves a good rummage in the dressing up box.
But now Katy Perry has taken her love for fancy dress to a whole new, crazy level - and it's got us questioning reality.
The pop superstar is pretty much unrecognisable in a preview clip from brand new video for Birthday as she dons some *very* clever prosthetics to transform herself.
We're pretty much blown away by the how totally and utterly different the newly-single star looks as she turns herself into a old woman, a Jewish entertainer and a clown aka The World's Worst Party Entertainers.
While it's all just a *little* bit creepy, we're pretty darn impressed with Katy's acting skills in the clip... which will soon be turned into a full-length vid for the single.
In the teaser, the popstar takes on the identity of a number of different entertainers... and they're not the best looking bunch.
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