Billie Joe Armstrong's onstage meltdown at last weekend's iHeartRadio festival occurred when the Green Day frontman heavily imbibed after more than 12 months of sobriety, claims Claudia Suarez Wright, the ex-wife of drummer Tre Cool. Wright confirms reports that Armstrong has since sought out substance abuse treatment. "He's doing OK. He's with his family," she tells Celebuzz. "He's in rehab and his family is by his side."

So, what went down in Sin City, anyway? “When he was in Vegas he was drinking a lot. The night of the show he had been drinking,” says Wright. “In Las Vegas there’s a lot of temptation to drink and it’s tough to be around when you’re fighting against it."

"They have a new album coming out and it’s a demanding lifestyle," she adds, referring to the band's latest disc, ‘¡Uno!,' which dropped Tuesday. "It’s very difficult.”

If true, Wright's claims contradict a report in the Chicago Sun-Times from “sources close to the band” that Armstrong's outburst was the inevitable outcome of a steady decline due to his “abuse of various substances," and that bandmates Cool and Mike Dirnt were part of a long-overdue intervention that finally convinced the singer that he needed to seek help.