Katy Perry and Justin Bieber to perform at Grammy Nominations Concert

The Grammy Nominations Concert promises loads of fun and entertainment, as Katy PerryKaty Perry and Justin BieberJustin Bieber are all set to rock the stage of the concert later this year. Along with Katy Perry and Justin Bieber, the wonderful stars that have given a nod to performing at the Grammy Nominations Concert are Miranda LambertMiranda Lambert, B.o.B, and Bruno Mars.The concert titled "