Last year, rumor had it that Bieber was in talks to be the show's permanent new host, but now MTV is mixing things up, having a different celebrity act as host for each episode.
So who did the Biebs punk on Friday in Los Angeles for his episode? None other than his pal Taylor Swift, just days after he joined her on stage at her "Speak Now" tour stop in L.A. to perform a duet of his hit song 'Baby.'
We don't have any details on exactly what the prank was, but celebrities should officially be on their toes again knowing that if something seems to crazy to be real, it probably is -- and one of your famous friends is probably behind it.
Kutcher will still serve as executive producer for the hidden camera series, which he co-created with Jason Goldberg back in 2003. After eight seasons, 64 episodes and 137 celebrities 'Punk'd,' the show took an extended break after the Season 8 finale in May 2007. No word from MTV yet on when Season 9 will air.
Tell us: Who would you like to see get 'Punk'd'?