This artist knows how to have a good time, even when it means playing a friendly prank on others.Justin Bieber showed up for an appearance on The Ellen DeGeneres Show on Friday, which was guest-hosted by the previous day's guest — Bieber's pal Demi Lovato.While there Justin, 26, showed a clip of his recent shenanigans at theWarner Bros.
Studio Tour in Los Angeles, California, in which the Yummy crooner posed undercover as a tour guide on the replica set of beloved Nineties TV show Friends.
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