The footage made it online, forcing the Gossip Girl star to install strict new rules at gigs.
Taylor Momsen took to the stage again in Los Angeles on Wednesday (27Oct10) - and stunned the crowd by asking everyone with a camera or mobile phone to put it away.
She told the crowd: "I know this is the modern age and everyone's got cameras and cell phones and video cameras. But I'd really appreciate it if you'd put that f**king s**t down.
"I know it's very cool to videotape and put it on YouTube the next day. But, frankly, it completely takes away from the show. I'd thoroughly appreciate it if you'd put that s**t down and put your hands in the air…I want everyone's hands in the f**king air."