PASADENA, California — The Backstreet Boys were congregating backstage at Saturday's Wango Tango On-Air festival when a herd of security guards nearly tumbled them.

"They were like, 'Move out of the way, get up against the wall,' " Nick Carter recalled later, smiling and likely embellishing a bit. "And then William Hung came through."

"Who?" Kevin Richardson asked. "Well Hung?"

(Click for photos.)

Joke or not, on a bill that included Janet Jackson, Lenny Kravitz, Jessica Simpson and a dozen other acts, William Hung was the headliner.

After 14 hours of pop, rock, hip-hop, R&B and everything in between, the "American Idol" reject, dressed in a paisley disco shirt (complete with butterfly collar) and flanked by a dozen scantily clad dancers, performed his now infamous rendition of "She Bangs."

"There's 60,000 people here," Hung said minutes before. "It's huge. I'm nervous."

Hung seemed a little overwhelmed onstage, staring blankly at the enormous monitors, but he pulled it off like a true ... pro.

Backstage, when he wasn't practicing, Hung mingled with Big Boi and the Black Eyed Peas. "I'm in William Hung's dressing room," JC Chasez said, before making circles with his fists a la Hung's signature move. "She stings like a bee," JC sang.

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