The singer appeared to be tired and emotional as they performed at the Gexa Energy Pavillion in Dallas on Friday. After spending some time speaking incoherently, he told the crowd: "I'm going to go backstage and vomit, drink a beer and then come back out and play three more songs."

He added: "For the record, I'm not drunk – I'm just f**king hot." But he didn't return, leaving brother and bassist Jared to announce: "We are so unbelievably sorry. It's beyond out control. It's really not our fault – it's Caleb. He can't play the rest of the show.