Full Video: Justin Bieber Sings At 2011 Grammys Awards

Justin Bieber has performed at the 2011 Grammy Awards.The teen pop star performed his hits ‘Baby’ and ‘Never Say Never’ on-stage with various dancers including some dressed in ninja costumes.Bieber is nominated for two Grammys today.Justin Bieber and Usher - each with two Grammy noms - split some stage time. First up was Bieber, with an acoustic micro-version of "Baby," followed by a full-out