Billie Joe Armstrong

Green Day frontman Billie Joe Armstrong has checked into rehab.

It's unclear why specifically he did so, but the band issued a statement saying he'll be “seeking treatment for substance abuse,” following his epic on-stage rant in Las Vegas Friday night.

Believing Green Day was being cut off prematurely at the iHeartRadio Festival, Billie Joe exploded in an expletive-laden tirade, bashing Justin Bieber and smashing stuff (you gotta see it):

Green Day Flips Out at iHeartRadio Festival

Armstrong’s bandmates said he was mistaken about the gig.

“Green Day would like everyone to know that their set was not cut short by Clear Channel and to apologize to those they offended at the iHeartRadio Festival in Las Vegas,” the statement reads.

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One minute? ONE MINUTE!?!

No one tells Green Day to get off the stage. While performing at the iHeartRadio Festival in Las Vegas on Friday night, the band's frontman, Billie Joe Armstrong, flipped out when producers informed him his set would be cut short by approximately 20 minutes.

Usher's set reportedly ran over beforehand, leaving Billie Joe, Tre Cool and Mike Dirnt less time to perform. After seeing "1 Minute" flash on the screen in front of him, cueing him to wrap it up, Armstrong lost it in an amazing rant that was nothing short of awesome to watch:

Green Day Flips Out at iHeartRadio Festival

“You’re gonna give f*%king me one minute?!” he yelled, distraught, after cutting off his last tune.

“Let me tell you something. Let me f*%king tell you something! I’ve been around since f*%ing nineteen eighty f*%king eight, and you’re gonna give me one minute?!"

"You’ve gotta be f*%ing kidding me! I’m not f*%ing Justin Bieber, you motherf*%ers! This is a f*%king joke. Let me show you what one f*%ing minute f*%ing means."

A guitar was smashed, a middle finger was shown to the powers that be, and the band was gone.

Rock n' roll.

Green Day frontman Billie Joe Armstrong was abruptly rushed to an Italian hospital after suffering an undisclosed illness, but has since been released.

He and the band will perform tomorrow at the MTV Video Music Awards.

It's unclear what sidelined Billie Joe last weekend, but he was reportedly spotted in L.A. with no voice, prompting speculation that it was throat-related.

Mike Dirnt, Tre Cool on Billie Joe Armstrong

Armstrong's illness forced the pop-punk group to cancel their show in Bologna, Italy, on Sunday, and bandmates Mike Dirnt and Tre Cool released a brief video message to fans, apologizing for missing the European tour date (above).

Cool said of the cancellation, "We're beyond devastated, we're as sad as you guys are - Billie's extremely upset about it, and we'll see you very soon."

Both rockers emphasized that the group would return to the Italian city as soon as they can. In the meantime, they'll rock the house on MTV Thursday.