Caleb Followill
Caleb Followill, lead singer for "Kings of Leon," performs on NBC's 'Today' show in New York, July 31, 2009. REUTERS

So, after all the rumors, Twitter rants and online videos, will Kings of Leon front man Caleb Followill enter rehab?

His band mates certainly think so, according to an US Weekly report on Tuesday.

"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 a while," a source told Us Weekly.

The 29-year-old rock star and his band made headlines over the weekend, when Followill left a Dallas show just four songs in.

The show never finished, and Jared, Nathan and Matthew Followill were left to explain their lead singer's exit to the crowd.

"Caleb's just a little unfit to maybe play the rest of the show . . . We're really really sorry guys . . . it's really not our fault, it's Caleb. He can't play the rest of the show," the band said.

The Kings of Leon have since cancelled the rest of their U.S. tour, with a Sept. 28 Vancouver, Canada date listed on their official Web site as of Tuesday afternoon.

"We are so sorry to say that Kings of Leon are cancelling their entire U.S. tour due to Caleb Followill suffering from vocal issues and exhaustion. The band is devastated, but in order to give their fans the shows they deserve, they need to take this break. Unfortunately, the U.S. dates cannot be rescheduled due to the band's international tour schedule," the group wrote on their Web site.

Drummer Nathan Followill even took to Twitter to reassure fans of the band's future.

"Bummed about the tour not happening. So sorry 4 all the fans. We just need some rest. Thanks 4 understanding. WE ARE NOT BREAKING UP!" Followill wrote.

About the Kings of Leon:

The Nashville-based band was formed in 1999 and was originally inspired by Southern rock and blues.

The Kings of Leon first rose to international fame with the 2009 single, "Sex on Fire."

Following the success of "Sex on Fire," the band's second single from the album "Only by the Night" earned them a Grammy Award for Record of the Year.

The Kings of Leon is comprised of brothers Caleb, Nathan and Jared, and their cousin Matthew.

Caleb Followill married Victoria Secret model Lily Aldridge on May 12, 2011.

The band's fifth studio album, Come Around Sundown, was released on Oct. 18, 2010.

In April 2011, the Kings of Leon headlined the Coachella Valley Music Festival, along with Kanye West and the Strokes.

Also in April 2011, the band made their big screen debut with the documentary, "Talhina Sky: The Story of Kings of Leon," which premiered at the Tribeca Film Festival in New York City.