It's also possible that the whole Hannah Montana/Disney squeaky clean teen pop star is never who she really was to begin with.  Sure, at the beginning maybe, when she was much, much younger.  But as people grow up they grow into the adult version of themselves.  It's possible she stopped being that wholesome artist long before she was done being HM, and this is more of the person she really is.  Maybe it's a more extreme version, but I think we'd be naive to pretend that this is all just marketing.

I think the real Miley Cyrus falls somewhere in-between Hannah Montana and the current Miley Cyrus.