dy A's Kelley and Dave Haywood helped their good buddy write his hit, "Do I."
Paisley, after a performance of his single "Water" where he fell backwards into a pool of water on stage, won top male vocalist of the year for the fourth consecutive time.
And Brooks & Dunn, who are retiring after a summer tour, won best vocal duo for the 10th time in their two-decade long career.
"We are currently in therapy with Brett Favre trying to figure out how to waffle on this," Kix Brooks joked after the win.
The show, held at the MGM Grand, was heavy on performances. It kicked off with Carrie Underwood and Lambert, joined on stage later by Brad Paisley, Charlie Daniels and John Fogerty, who ripped through a rendition of Creedence Clearwater Revival's "Travelin' Band."
"That's how you start a television show, son!" shouted Daniels, who recently recovered from a stroke.
Swift began her performance of "Change" while soaring over the crowd on a platform. She ripped off her white dress and reveal a black outfit underneath, made her way through the crowd and joined the Tritones, a college co-ed a capella group on stage for a spirited chorus. She then fell backward into a crowd of fans.
The Zac Brown Band wasn't able to make a show because of a USO tour in the Middle East. But the band sent video of a performance of "Chicken Fried" from overseas that included altered lyrics aimed at the military.
Keith hit an emotional note with a performance of "Cryin' For Me (Wayman's Song)," dedicated to his late friend, jazz artist and former basketball star Wayman Tisdale, who died last May.
The show also had it's share of non-country celebrities, including LL Cool J, Olympic gold medalist Lindsey Vonn and Las Vegas staple Cher, who goofed when she announced that Blake Shelton had already won a CMA Award - instead of an ACM - the previous evening.