How Long Will Green Day's Billie Joe Armstrong Be In Rehab?
Description:A public meltdown at the iHeart Music festival in Las Vegas prompted Green Day frontman, Billie Joe Armstrong, to deal with his substance abuse issues. Now, Billie's long time producer, Rob Cavallo, speaks out on how long the 'Holiday' singer will be in rehab. Billie's trip to rehab prompted the band to drop out of a music festival and delay their tour.(1:01)