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The duo category's reigning champ, Sugarland -- which consists of Jennifer Nettles and bandmate Kristian Bush -- arrived ready to defend their crown.

2012 Academy of Country Music Awards

Country crooners including Carrie Underwood (showing a little leg a la Angelina!), Taylor Swift, Blake Shelton, Miranda Lambert, and Jason Aldean hit the red carpet in Sin City on Sunday for one of country music's biggest nights.