Pentatonix AMA 2012 Pre-Show Medley -- Justin Bieber, Taylor Swift & Nicki Minaj

Pentatonix AMA 2012 Pre-Show Medley -- Justin Bieber, Taylor Swift & Nicki Minaj Subscribe to Hollywire | Send Chelsea a Tweet! | Follow Hollywire! | We were lucky enough to catch up with one of our favorite groups Pentatonix at the 2012 American Music Awards this past weekend. They chatted all about the release of their Christmas album, which has risen to the top of the ITunes Christmas charts, and also performed their c