Video: Backstage at the Grammy Nomination Concert!

ET has your pass to all the Grammys action -- our Kevin Frazier was at last night's big concert special, where he talked to first-time noms the Jonas Brothers, plus John Mayer, Christina Aguilera and more!

"We're smiling from ear to ear," Nick Jonas told Kevin backstage.

Mayer stayed mum on his relationship with Jennifer Aniston, but Christina says she has a new love -- her baby boy! "He's my first love now above anything else," she adds. "But it's important to me to stay true to the person I was before I gave birth."

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