"We're Foxboro Hot Tubs from Austin, Texas!" Billie Joe Armstrong lied to a packed indoor theater at Stubb's BBQ on Saturday for Rachael Ray's Feedback party. The Hot Tubs — a long-running Green Day side project — rocked with pure abandon, as if Armstrong had become a new man when freed of his trio's brand name. They ripped up a mix of Foxboro originals, covers, and Green Day tunes (though no famous Green Day tunes), in front of a delirious fist-pumping crowd. Wearing a Mötley Crüe T-shirt beneath a skull-and-crossbones jacket, Armstrong also took the award for best use of party favors, frantically spraying the crowd with Silly String, beer, water and confetti streamers during explosive takes on "Supermodel Robots" and "She's a Saint, Not a Celebrity." Tre Cool looked a little Devo behind the drum kit in his specs and slick short hair, while bassist Mike Dirnt hopped and thrashed in zebra-print and shades, as Armstrong tumbled backward into the crowd and welcomed fans into his old-school punk rock paradise.