A video has been leaked onto the internet, claiming to have captured the sound directly from Britney Spears's microphone during a live show in Las Vegas.

All well and good, you may say; the problem is that the troubled singer's vocals are well dodgy, which does nothing to dampen the rumours that Spears largely relies on a backing track for her live performances.

The video can be seen at the site Ebaumsworld by clicking here.