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.”

Country star Luke Combs threw a whole lot of exciting curveballs during his headlining Stagecoach set on Sunday (April 27) and one of them was an appearance from pop-punk icons Good Charlotte. Benji and Joel Madden hopped onstage with Combs to perform “The Anthem,

The musician took his own turn popping up during another artist's performance when he joined Backstreet Boys for "I Want It That Way" later that night