Justin Bieber Surprises Fans on 'Friends' Set: Watch

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. He even took a selfie with a duo who had no idea they had just gotten a photo with the superstar.

For the most part, Bieber had the tourists fooled, but one Belieber sat down on the iconic Friends couch with her family and recognized the crooner instantly.

After airing the clip, guest host Demi Lovato noted that one couple JB fooled was in the audience, and they had no idea it was the star until they watched the video at that moment. “You had no idea until right now? You thought it was just some weird guy?” Bieber asked, shocked. “Did you think the guy was weird or did you think he was kind of cool?”

“I thought he was both,” the fan hilariously replied. Watch it all go down below.