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Luke Bryan performs for a massive, sold-out crowd at Global Life Park in Arlington, Texas.

A 30-year veteran of the business teams with an ACM-nominated up-and-comer for Friday night's huge concert in Arlington, Texas.

The longtime friends, who toured together back in the Nineties, reunited in Texas.

Luke Bryan performed with Country Music Hall of Famer Ronnie Milsap at the ACM Party for a Cause.

Josh Abbott Band members pose after their set at the ACM Party for a Cause.

Dierks Bentley, Ashley Monroe and Kip Moore became a trio for the ACM Party for a Cause.

Darius Rucker performed with Sara Evans at the ACM Party for a Cause.

Dwight Yoakam and Sam Hunt swap lines on each other's hits at the ACM Party for a Cause.

The four country singers catch up and pose for photos during a rain delay at the ACM Party for a Cause.

They weren't broken up for long. After calling it quits in 2010, Kix Brooks and Ronnie Dunn are back together for a string of shows in Las Vegas. They reunited for a live performance for the first time in more than four years Friday night.

Luke Bryan steals a kiss from wife Caroline before performing with Ronnie Milsap at the ACM Party for a Cause.

Sara Evans strikes a pose backstage before performing at the ACM Party for a Cause at Globe Life Park in Arlington, Texas.

Kip Moore and Darius Rucker goof off before taking the stage at the ACM Party for a Cause.

Duet partners for the evening, Sam Hunt and Dwight Yoakam share a laugh backstage.

The future Las Vegas show mates hang backstage before reuniting onstage at the ACM Party for a Cause.