Still, that hasn't stopped thousands of people (celebs included) from flocking to Sin City to see the performance first-hand. According to one member of Brit's management team, it really is a performance and needs to be viewed as such.
"To put on the show that she puts on, it's virtually impossible to sing the entire time and do what she does," Adam Leber told The Medium. "She's singing on every song, basically, when she has the ability to sing. There's no way you can dance for 90 minutes straight and sing the entire time."
Fair enough. If you haven't ever locked yourself alone in a room and attempted some of the pop star's choreography, go ahead and give it a try. Then, once you catch your breath, try to belt out a tune. Now, combine the two.
How'd it go? Probably not well...
Britney is a singer, not a superhero. If people want her to just stand there and sing and not move or put on a SHOW at all, we're sure she'd be happy to oblige. If she is lip-syncing, she's certainly not the first singer to ever do that and we're sure she won't be the last.
In a perfect world, singers would be able to do incredible, captivating dance numbers AND hit every high note Mariah Carey-style in the process, but we don't live in a perfect world and neither do our pop stars. We'd still go to the show, though.
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Gallery | Britney Spears Through the Years