"Quicksand" Fake.

“The rumored clip of Britney Spears’ Song, Quicksand, which I wrote that is being viewed online is totally not legit, and is farthest from the actual track. I’ve heard it many times, and if the song is put on the record, you’ll all see it then and only then. Until My work is 100% complete it is not to be posted all around the web and that goes against everything that I believe in as I do my job”

Source: WorldOfBritney