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Katy Perry
The much-nominated pop star put miseltoe on her head and sang "California Gurls" again.
Keep clicking for more highlights from the all-star concert announcing the 2011 Grammy Award nominees!
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Bruno Mars
With seven nominations, Bruno was so happy he pretty much bounced through his performance of "Beautiful Girls" with B.o.B.
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Jeff Kravitz/Filmmagic
Justin Bieber
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Miranda Lambert
No surprise, the "The House That Built Me" crooner took quite a few noms, Country and otherwise.
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B.o.B.
He joined Bruno Mars in quite a few joint nominations, and then on-stage.
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Train
Pat Monahan and his band landed a nom for "Hey, Soul Sister."
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LL Cool J
He must be doing something right, because the rapper keeps getting the gig to host the Grammy nominations concert.