AceShowbiz -

Kings of Leon scrapped their U.S. tour and denied that they were breaking up but did not exactly reveal what the real problem is. Turns out, the band want to give frontman Caleb Followill a time to get help in rehab for his drinking problem.

The band previously said that Caleb was "suffering from vocal issues and exhaustion" but his brother Jared Followill indicated something more serious on Twitter when he wrote, "I know you guys aren't stupid. I can't lie. There are problems in our band bigger than not drinking enough Gatorade."

An insider told Us Weekly, "They are trying to get Caleb to go to rehab. It is mostly for alcohol. [That's why] they ended up canceling the whole tour... he drinks like a fish." Caleb indeed showed the symptoms during the cut-short Dallas concert when he said he was going backstage to drink beer.

Another source quipped, "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 has been fighting for awhile." Third source said they never discussed Caleb's drinking as a problem before because they all drink on the road.

TMZ caught up with Caleb while he was out in New York City. He said, "I'm just trying to get better".