The country star also debuted a new song with Bailey Zimmerman called "Backup Plan," and later showed up as the Backstreet Boys' guest

Combs keyed up expectations as he told fans something special was on the way to help him close out an already-rousing festival set. Playing somewhat coy, he sang the first portion of "Friends in Low Places," only for Brooks to quietly appear on stage and take over.

Luke Combs closed out the night with a headlining set that perfectly captured the festival’s spirit, blending country tradition, heartfelt storytelling, and a few unforgettable surprises along the way for the official finish line of the Stagecoach Country Music Festival on Sunday night.