08/02/2011 04:27 pm ET | Updated Oct 02, 2011

Report: Kings Of Leon Urge Caleb Followill To Enter Rehab

Kings of Leon fans were not happy on Monday when the band cancelled its entire U.S. tour. Although the band said that lead singer Caleb Followill was "suffering from vocal issues and exhaustion," an insider close to the Grammy winning Tennessee band tells Us Weekly the problem actually stems from frontman Caleb Followill's excessive drinking.

"They are trying to get Caleb to go to rehab. It is mostly for alcohol," the source told the magazine. "[That's why] they ended up canceling the whole tour...he drinks like a fish."

Kings of Leon were forced to cut short a concert in Dallas on Friday when Followill abandoned the stage after telling the anxious crowd, "I'm gonna go backstage and I'm gonna vomit, I'm gonna drink a beer."

A second source reportedly confirmed to US Weekly: "It's true. Caleb's drinking is out of control and they are trying to get him into rehab. It's a dark demon he's been fighting for awhile."

However, Kings of Leon's representative stated that Caleb Followill was required to take vocal rest, and told Us Weekly that the band "look forward to getting back on the road at the end of September."