Zach Galifianakis puts the Biebs to the test!

The crew at Funny Or Die has teamed up once again with comedy star Zach Galifianakis for the latest edition of the viral sensation internet series, "Between Two Ferns."  This time his guest is arguably the biggest star in pop music, Justin Bieber.  Galifianakis doesn't go easy on the Biebs either, even offering up a spanking to his guest when he can't explain some of his career low-lights!  Check out the latest "Between Two Ferns" HERE!