A clip of Britney Spears singing 'Alien' without auto-tune has leaked.

Track producer William Orbig has released a statement stating that this is a 'vocal warm-up session' and that 'ANY singer when first at the mic at a start of a long session can make a multitude of vocalisations in order to get warmed up'

Final or not.. yikes! Take a listen

PICS: Britney's Best Covers

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