Oops, she faked it again!

Hundreds of angry fans stormed out of a Britney Spears concert in Australia on Friday night, complaining that the singer lip-synched her way through a lackluster performance.

Some of the concert-goers were so livid they asked for their money back, and that the debacle has renewed calls for a law protecting fans from being “duped” by performers who pretend to perform live, according to the Australian news Web site, Perth Now.

Spears was caught mouthing the words to her show during a 2007 concert at the House of Blues in San Diego.

Photonews / Splash News

Britney Spears