Photo SpecialExclusive! Backstage at the ACM Awards

See your favorite country stars (Kellie! Carrie!) smile for the PEOPLE camera at the 43rd annual Academy of Country Music Awards

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JAMES OTTO

With the No. 1 hit "Just Got Started Lovin' You" under his belt, Otto had reason enough to party at the awards. "I used to have too much fun in Vegas, and I've learned over the years to pace myself," he told PEOPLE. "But tonight is the night I'm going to get a little buck wild."

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