Surprise, surprise: Billie Joe Armstrong from the band Green Day is headed to rehab just days after going ballistic onstage on the IHeartMusic Festival, smashing his guitar and screaming the word "fuck" repeatedly.

Armstrong lost his marbles onstage when he was told the band had one minute left to perform. In his profanity-fueled rant, the lead singer screamed that he was "not fucking Justin Bieber" and declared "I've been around since 198-fucking8." Now a rep for Green Day tells TMZ that the band is postponing future shows so Armstrong can check into rehab for substance abuse. Said the rep, "Green Day wants to apologize to those they offended at the iHeartRadio Festival in Las Vegas." I think that means you, Justin Bieber. 

Good luck in rehab, Billie Joe. I hope you have the time of your life, yuk yuk.

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