POTW: Kevin Jonas, Jay-Z, Lady Gaga, Rihanna
Lady Gaga expresses her animalistic side while crowd surfing during the Semi Precious Weapons' Lollapalooza show on Aug. 6.

Green Day Gets Fans Into the Act

During the two-and-a-half hours that the Bay Area's favorite sons rocked Lolla's main stage on Saturday, the trio had no problem sharing the spotlight with a few very lucky fans. During 'KnowYour Enemy,' Billie Joe called a flag-waving boy onstage and coerced him to stage dive into the photo pit. Later, a little girl joined the band center stage and sweetly pretended to be knocked unconscious by a booming pyrotechnic. Then Billie Joe called yet another fan onstage to sing lead vocals on their slacker hit "Longview." And we're pretty sure they all had the time of their lives.