feminism isn't just about individual expression but about making the world a better more equal place for everyone....or if you can't do that then at least don't make it worse for the rest of us!
It is perfectly feminist to make money by getting naked if that is what you want to do...and in a perfect world where your actions don't affect other people that would be the end of it.
But in this world here, the one we actually live in, MC's actions make life noticeably worse for swathes of the population, all the way from teenage girls who feel increased pressure to become sexually active before they are ready, through even younger and younger girls believing that their looks are their defining characteristic, up to old farts like me working in male dominated environments who find themselves in a professional setting suddenly being faced with questions about twerking.
So no Miley you are not a feminist because you don't give a shit about the result of your 'self-expression' on the rest of woman kind (or human kind for that matter).