The rapper's cover was blown when he repeatedly missed his cues and fell victim to a technical mishap that left the music playing in a loop without the expected recorded vocals to go along with it.
The whole thing was a mess, but 50 just kept struttin'... Katy Perry's oops moment didn't even involve her singing.
You mean you don't remember her classic song "Rumors"?
That might be because 1) it was an absolutely horrid song, and 2) because Li Lo lost quite a bit of credibility when fans realized all her performances were clearly set to a recording.
The infamous Rob and Fab, who fronted Milli Vanilli, never actually sang a note on any song, live or otherwise.
It was some other dudes who weren't so, shall we say, aesthetically pleasing.
We've all seen it: The embarrassing moment in a pop star's career where the music just doesn't quite match up to what their mouths are doing.
But Lady Gaga lost her shot at such a pass when she went on this self-righteous tirade: Okay, we get it.
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Although her band rolled with the control room's mistake (because they can actually play), Ashlee was too thrown off to fake faking it.
Her only resort to cope with the embarrassment was to dance a ridiculously awkward jig.