The recording of the song from 2013 album "Britney Jean" is pretty embarrassing, but "Alien" producer William Orbit rushed to Spears' defense on Facebook, claiming it was a throwaway recording of Spears warming up.
"Dearest Music Lovers, I have heard that Britney vocal link that everybody’s been discussing ... I'd like to affirm that ANY singer when first at the mic at the start of a long session can make a multitude of vocalisations in order to get warmed up.
"Warming up is essential if you’re a pro, as it is with a runner doing stretches, and it takes a while to do properly. I’ve heard all manner of sounds emitted during warmups. The point is that it is not supposed to be shared with millions of listeners ...
"Whomever put this on the internet must have done so in a spirit of unkindness, but it can in no way detract from the fact that Britney is and always will be beyond Stellar! She is magnificent! And that’s that."
"All manner of sounds emitted"? Yikes.
In case you want a reminder, here's the final version of Spears' track: