Justin Bieber Pranks People Undercover on the Set of 'Friends - Watch! (Video)

Justin Bieber is tricking people!

The 26-year-old Changes singer made an appearance on The Ellen DeGeneres Show on Friday (March 6), guest-hosted by Demi Lovato.

PHOTOS: Check out the latest pics of Justin Bieber

During his appearance, Justin participated in a hidden camera prank, where he dressed up as a Warner Bros. tour guide and went to the set of Friends to talk to unsuspecting tourists.

While on the show, he also opened up to Demi Lovato about his relationship with Hailey Bieber, and says he’s in an “arranged marriage.” Watch him explain!

Watch Justin Bieber‘s Friends prank…