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

The best moments from Stagecoach Sunday's third and final day of the festival, including Luke Combs, Midland and the Backstreet Boys.

Combs first brought out Zimmerman as they performed their collaboration, “Back Up Plan,” followed by surprise guests Good Charlotte. First, Benji and Joel Madden performed their hit “The Anthem” with Combs, then joined in on their “favorite” one of Combs’ hits, “Where the Wild Things Are.”