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!
With seven nominations, Bruno was so happy he pretty much bounced through his performance of "Beautiful Girls" with B.o.B.
The Best New Artist nominee seemed super sleepy during the show, but he woke up in time to perform "My Favorite Girl."
No surprise, the "The House That Built Me" crooner took quite a few noms, Country and otherwise.
He joined Bruno Mars in quite a few joint nominations, and then on-stage.
Pat Monahan and his band landed a nom for "Hey, Soul Sister."
He must be doing something right, because the rapper keeps getting the gig to host the Grammy nominations concert.
NEXT GALLERY: Fashion Spotlight—2011 Grammy Nominees