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Last Updated: Monday November 01 2010 16:29 GMT

Justin Bieber gets his own back on Will Ferrell!

Singing sensation Justin Bieber showed everyone he's a prankster by getting his own back on actor Will Ferrell.

They were both out on the red carpet at the American premiere of the new film, Megamind, and Will was being interviewed about his role in the movie.

But Justin remembered a prank the Hollywood star had played on him - now it was time for his revenge!

Check out the clip!