We never thought Britney Spears' songs were untouched in the recording studio, but the singer's voice without Auto-Tune is even worse than we could have imagined. Take a listen: The video has picked up so much steam online that the song's producer, William Orbit, posted a statement to Facebook explaining that the track is from a vocal warm-up session, not a final take.

Here is a look at the leaked version (you can then compare  it to the studio version)

Song producer William Orbit, posted a statement to Facebook to say the leaked track is from a vocal warm-up session and was not a final take.

Studio version