I know, but when you are offered a "role" in a music video/movie/tv show, you never know for sure if it's gonna be popular or not. So if it involves nudity, its normal to think twice about doing it. As in: "do I really wanna be topless in a random music video?!"
but she's always been so wishy washy. First she wouldn't do nude photos and then nude photos came out and she raged against that photographer. Then she's topless on instagram with Dan Brazillerian? Also it's not really a random video, it was Robin Thicke, Pharrel, and TI.