It's pretty common knowledge that Britney Spears is notorious for lip-syncing at her shows...but apparently Britney gets offended by those allegations.
"A lot of people think that I don't sing live. Because I'm dancing so much I do have a little bit of playback, but there's a mixture of my voice and the playback.
It really pisses me off because I am busting my ass out there and singing at the same time and nobody ever really gives me credit for it."
(Photo: Getty Images)