The writers are amazing ... They're huge Britney fans and apparently it was written through Britney's perspective before they even knew it was going to her.
They wrote 10 other tracks specifically for her as well, but they said the album was "politically tied up" by that point.
Their goal is to land 10 tracks on Britney's next album and they'd love to executive produce the entire thing, they state it was Brit's fave track & were a bit shocked it was made a Japanese deluxe track, but understood the decision.
http://popcrush.com/britney-spears-m...iew-exclusive/