Former PJ Almighty contender(s) Robots With Rayguns has (have) made a 'mashup' of Britney's 'Work Bitch' and Iggy Azalea's 'Work'.
It's called 'Working Overtime'.
It's quite a subdued affair considering the two originals and can be downloaded for free from the Soundcloud player below (although you do have to click on about thirty different web pages to get it, apols).