Destiny's Child star's [uuid=de708e43-2082-4599-927f-5fcc9450c51f]performance was live[/uuid].

Over at Jezebel, a tipster sent in a link to the Wall Street Journal's video of Bey's performance, claiming: "The camera man was using his own mic, and he/she were so close that he could hear the mic feed over the speakers, AND Beyoncé's actual voice.

"That echo is the feedback, which is why she took her ear piece out. Yes there's a backup track, but she is singing full out. Don't believe the Beytheists."

Keep it MTV.co.uk for more on this story.

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