Pentatonix ~ Medley: Oops!...I Did It Again / Toxic / Hold It Against Me ~ The Sing-Off

Awesome Britney Spears Medley by Pentatonix, season three champions of "The Sing-off"! http://www.ptxofficial.com/   / pentatonix   DISCLAIMER: I own nothing! This video is for entertainment purposes only. No copyright infringement intended! © NBC Universal, Inc. SYCO TV & FremantleMedia North America, Inc and Sony Music Entertainment.