Notorious prankster Justin Bieber had some tricks up his sleeve while visiting the Ellen DeGeneres Show on Friday (March 6).
The crooner followed in Jennifer Aniston's footsteps, and went undercover on the Friends set on the Warner Brothers Studio Tour in Los Angeles.
Dressed as the tour guide in an official uniform, hat and mustache, the singer welcomed unsuspecting visitors and took their photos.
Bieber pushed buttons a bit, asking weird questions, fluffing the dusty pillows in fans' faces and telling one couple that their photo looks much better when they're turned away from the camera.
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