A Justin Bieber Birthday Card, from Billboard.com

Katy Perry and Justin Bieber will perform at a show to announce the Grammy nominations, organizers 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."

Eminem, Lady Antebellum Expected to Lead 2011 Grammy Nominations

The show, hosted by 42-year-old rapper LL Cool J and held in Los Angeles, will air on December 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.

(Reporting by Christine Kearney, editing by Bob Tourtellotte)

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