It was about time for another Brit-Brit scandal.
The on-the-rebound pop princess is causing controversy again, accused of lip syncing on stage during the Australia leg of her "Circus" tour.
According to People magazine, about 100 infuriated fans ditched Spears' Perth show Friday, blaming her subpar performance and lack of real singing. The following day, singer/songwriter John Mayer, who's also in the Outback, posted the following update to his Twitter account:
"If you're shocked that Britney was lip-syncing at her concert and want your money back, life may continue to be hard for you."
Ouch. ABCNews.com's calls and e-mails to Spears' publicist for comment were not immediately returned.
It's not the first time Spears has been accused of lip syncing, and she's certainly not the only star to come under fire for it. Below, check out a run down of five uber controversial alleged lip-syncs, and the verdict on whether or not each artist committed what many fans regard as the greatest on-stage sin of all.
No one ever said it would be easy, Yeezy.
Kanye West added himself to the roster of music's most infamous on-stage mishaps in December 2008 when he failed to nail his performance of "Love Lockdown" on "Saturday Night Live."
To be fair, West's greatest strengths lie in rapping and producing.
"Love Lockdown" and the album from which it hails, "808's and Heartbreak," are West's first foray into singing. But whether by his own fault or because of his audio equipment, his attempt to serenade "SNL's" audience came off as feeble at best, fueling rumors that he requires a little help in the vocals department.
From the moment West got on the mic, it was clear something wasn't right. Rob Levine, executive editor of Billboard magazine, speculated West's weak voice had to do with a glitch in the autotune feature many artists use to stay on pitch while recording in the studio and rocking out live.
"Autotune allows you to hit every note perfectly. You're not going to be sharp or flat," Levine said. "I think the effect wasn't fully realized, [the autotune] might have been set up wrong. But it's foolish to suggest he was lip-syncing. If he were lip-syncing, it would've sounded exactly the way he wanted it to."
Even if West didn't lip-sync, Tyler Gray, Blender magazine's senior editor, didn't let him off the hook.
"He was cheating. At the end of the day, did he make up for that lackluster element of his performance with something that balanced it out? I don't really think so. It was neat visuals, but the music wasn't quite up to par," said Gray.
"In the beginning, he got an A for effort because he was trying to break the mold," Gray said, referring to West's branching out from typical hip-hop techniques. "But the effort grade only goes so far. Now he actually has to sound good. And he didn't. He sounded like a bad talent show."
With pop stars like Spears, it's all but expected that lip-syncing will go hand-in-hand with a live performance. Levine called it an open secret in the music industry, the product of audiences expecting artists to sound the same on albums and on stage.