Grammys Performances: A Battle Of The American Idols

'American Idol' alums Carrie Underwood and Kelly Clarkson took the stage at Sunday's awards show.

Music fans can always count on the Grammys to deliver a diverse lineup of attendees and incredible performances. And although there were somber moments due to the continued shock of Whitney Houston's death, the evening's killer performances brought moments of levity, like those of "American Idol" alums Kelly Clarkson and Carrie Underwood.

Kelly Clarkson was up first with "Don't You Wanna Stay," her sweet and sentimental duet with Jason Aldean that was nominated for Best Country Duo/Pop Performance. Clarkson wore a floor-length black gown with a plunging neckline with metallic embellishments, her hair down and loose around her shoulders. Aldean, who was also nominated for Best Country Solo Performance, sported a suave-looking suit and his signature cowboy hat.

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Both artists and real-life friends, Clarkson and Aldean smiled at each other during the performance, their voices complementing one another beautifully. The only snag in the performance was at the very end when it seemed as though Aldean's mic stopped working. He kept singing, but Clarkson's voice was the only one heard on those last few notes.

Clarkson's "Idol" companion/compatriot Carrie Underwood performed her duet toward the end of the evening alongside music legend and 16-time Grammy winner Tony Bennett. They performed a stripped-down, shortened version of Bennett's classic "It Had to Be You," with piano accompaniment. Underwood dazzled in a fitted, glittery mermaid dress, and Bennett shined in a classic tux. Both Grammy winners seemed delighted to be performing together and equally excited to present the award for Best New Artist immediately following their performance.

Stick with MTV News for all the news on Whitney Houston's tribute, the Grammy red-carpet fashion, Grammy winners and more until the hangover wears off!