You're delusional if you think that a main stream celebrity is going to do pussy lip photos for release to the general public. Some celebs have had private photos leaked. A few have had wardrobe malfunctions showing them. Even when they do full frontal nudity in movies they often wear merkins, which means the labia will usually not be visible.
As "out there" as Miley is, I'm pretty sure that's a line even she won't cross.
When mainstream celebrities do nude photos for distribution, they pretty much always go for "artsy".
Well, not always. I don't know how old you are, but Hustler magazine used to have a readers poll every year to pick the celebrities that the readers would most like to see spreading their legs. They would take the top 10, and offer thew first one to accept, 1 million dollars to pose "hustler style". As far as I know, 1 did. Her name is Dale Bozzio, and she was the lead singer of a band called "Missing Persons". They were one of those poppy sort of electronic bands that came out in the early 80's. They had a couple of hits, and her husband Terry Bozzio, was the drummer. A phenomenal drummer actually. He's played with many bands in the studio, and toured with the late Frank Zappa for a long time. If you know anything about Frank's music, you know it's not easy to play. Anyway, if you look for her on the net, you will find her, naked, sowing her snatch, because she took the million bucks. I'm not sure if she's the only one, or if they still make the annual offer.
Personally, I think she does the artsy stuff because she wants to show off, but still hasn't become irrelevant enough yet, to go that route...like Courtney Stodden recently did.