Britney Spears 'furious' over song leak

Britney Spears 'furious' over song leak

Britney Spears is reportedly furious that an unfinished version of her new single has been leaked on the internet.
The Gimme More singer - who scooped three prizes at the recent MTV Video Music Awards - had been putting in "every hour under the sun" in preparation for her comeback in November with new track Womanizer.
http://www.nzherald.co.nz/entertainment/news/article.cfm?c_id=1501119&objectid=10533865

So is this all a publicity stunt?
Originally the leaked single was supposed to be "Candy from Strangers " and now it's " Womanizer".
Or is someone inside systematically releasing her singles?