Green Day performed at the iHeartRadio Music Festival on Friday night.  When Billie Joe Armstrong realized there was one minute left in their set, he ranted claiming that he is not Justin Bieber, he's been around for a little while, and he was generally displeased.  The F word was used so remember that if you are watching this video at work or something.

Sunday, Green Day announced that Billie Joe was checking into rehab.  They released the following statement:

"Billie Joe is seeking treatment for substance abuse.  We would like everyone to know that our set was not cut short by Clear Channel and to apologize to those we offended at the iHeartRadio Festival in Las Vegas.  We regretfully must postpone some of our upcoming promotional appearances."

Full disclosure, 1065 The END is a Clear Channel station (which is why you heard countless promos for the festival over the past several months).  But, we have no idea why Green Day's set was actually shortened.

We do now that Billie Joe Armstrong was hospitalized for 'dehydration' a few weeks ago.  We also know that 'dehydration' is rockstar code for 'strung out on something.'

The first of Green Day's trilogy of albums will release on Tuesday, so there were tons of promotional appearances which the band planned to make.  So, this is not a good time.