In the words of the lady herself: "It costs a lot to look this cheap." - great line!

I don't begrudge someone plastic surgery when their fame has been built on a *particular* look though. Dolly Parton's look is a C&W take on the busty, southern belle.
Of course, she does have the advantage in her field that part of the traditional (ie: non-'outlaw') C&W aesthetic is that artificial, 'rhinestones-&-dye', quasi-plastic look.