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L Cool J, Taylor Swift and Adam Levine onstage at "The GRAMMY Nominations Live!! — Countdown To Music's Biggest Night" on Dec. 5 in Nashville. Tune in to the 55th GRAMMy Awards 2/10/13 on CBS! Photo: Larry Busacca/Getty Images

Fun.'s Nate Ruess and Janelle Monáe perform on "The GRAMMY Nominations Live!! — Countdown To Music's Biggest Night" on Dec. 5 in Nashville. Tune in to the 55th GRAMMY Awards on 2/10/13 on CBS! #TheWorldIsListening Photo: Kevin Winter/Getty Images

LL Cool J, Taylor Swift and Maroon 5's Adam Levine backstage at "The GRAMMY Nominations Concert Live!! — Countdown To Music's Biggest Night" on Dec. 5 in Nashville #TheWorldIsListening Photo: Larry Busacca / WireImage.com

Co-hosts Taylor Swift and LL Cool J backstage at "The GRAMMY Nominations Concert Live!! — Countdown To Music's Biggest Night" on Dec. 5 in Nashville #TheWorldIsListening Photo: Larry Busacca / WireImage.com

Adam Levine performs at the #GRAMMYNoms Concert in Nashville on Dec. 5th. The 55th GRAMMY Awards air 2/10/13 on CBS! #TheWorldIsListening Photo: Christopher Polk/Getty Images

Taylor Swift co-hosting the #GRAMMYNoms Concert with LL Cool J on Dec. 5th in Nashville. The 55th GRAMMY Awards airs 2/10/13 on CBS! #TheWorldIsListening

Dierks Bentley and the Band Perry perform on "The GRAMMY Nominations Live!! — Countdown To Music's Biggest Night" on Dec. 5 in Nashville. Tune into the 55th GRAMMY Awards 2/10/13 on CBS! #TheWorldIsListening