Green Day singer Billie Joe Armstrong in rehab after onstage concert freak out
{{#rendered}} {{/rendered}}Green Day's front man Billie Joe Armstrong is entering rehab for substance abuse, a rep for the band tells TMZ.
The news comes just two days after Armstrong went ballistic in Vegas during a performance at the iHeart Radio Music Festival. He was videotaped screaming obscenities, slamming Justin Bieber and violently smashing his guitar on-stage.
The band's rep tells TMZ, "Green day wants to apologize to those they offended at the iHeartRadio Festival in Las Vegas."
{{#rendered}} {{/rendered}}The rep adds, "The band regretfully must postpone some of their upcoming promotional appearances.“