Justin Bieber and Katy Perry to Perform at Grammy Nominations Concert

Pop stars Katy Perry and Justin Bieber will perform at a show to announce the Grammy nominations, organisers for the top music awards said on Wednesday.
The 16-year-old Bieber and Perry, whose song "California Gurls" has been among the top U.S. pop hits of the year, will be joined on stage by country singer Miranda Lambert, rapper B.o.B and singer-songwriter Bruno Mars. B.o.B and Mars collaborated together this year for the single, "Nothin' On You."
The show, hosted by 42-year-old rapper LL Cool J and held in Los Angeles, will air on Dec. 1 on CBS. Grammy nominees in several main categories will be announced. The actual awards show, the biggest music awards in the United States, will be held on Feb 13

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