Green Day's Billie Joe Armstrong Seeking Substance Abuse Treatment
Green Day's Billie Joe Armstrong Seeking Substance Abuse Treatment

Green Day frontman Billie Joe Armstrong has been released from an Italian hospital after being admitted over the weekend, NBC reports. Armstrong's illness forced the pop-punk group to cancel a show in Bologna, Italy, on Sunday, and bandmates Mike Dirnt and Tre Cool released a video message to fans, apologizing for missing the European tour date.

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"We apologize profusely -- this is really unfortunate -- but Billie got rushed to the hospital last night due to illness and the doctors don't think it's a good idea for him to play today," Dirnt said.

Added Cool, "We're beyond devastated, we're as sad as you guys are -- Billie's extremely upset about it, and we'll see you very soon." Both rockers emphasized that the group would return to the Italian city as soon as the can.

Bologna was the trio's last international tour date in two-week run that took them through Japan, England, France and Germany. Green Day will be returning to the stage on Sept. 21 for the iHeartRadio music festival in Las Vegas, and then again on Oct. 27 for New Orleans' Voodoo fest.

"¡Uno!," the first disc in the band's upcoming album trilogy, drops Sept. 25, with "¡Dos!" and "¡Tré!" following on Nov. 13 and Jan. 15, 2013, respectively. The first single from the trilogy, "Oh Love," dropped in July and spends its fifth week at No. 1 on the Rock Songs chart this week. It became Green Day's 16th top three hit on Alternative Songs, setting the record for the most such hits by any act in the chart's history.

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Filmmakers Tim Lynch and Tim Wheeler have also created two Green Day documentaries to coincide with the release of the albums -- one that documents the making of the trilogy, and one created from vintage footage of the band. They will debut between late September and the middle of January, the band told Billboard in July.

Billie Joe Armstrong will also be joining the reality TV circuit this year, as a mentor for judge Christina Aguilera's team on NBC's "The Voice."