The 52nd Annual Academy of Country Music Awards kicked off on Sunday night at Toshiba Plaza in Las Vegas, and the red carpet had no shortage of memorable moments of country music's best and brightest. There was also a nostalgic dose of pop, thanks to an appearance from the Backstreet Boys. Nick Carter, AJ McLean, Brian Littrell, Howie Dorough, and Kevin Richardson looked like they meant business while posing in front of photographers ahead of their performance of "God, Your Mama, and Me" with Florida Georgia Line later that night. Although they sure clean up nice, a part of us still misses their matching blue and yellow sweatsuits . . .