FYI, it's standard procedure is to put a warning when linking to sites with nudity. To answer your question, search this forum for the term "high key". There are many threads on the subject.
First you need a gorgeous model like that. Second, you need composition skills like Sascha (the crop, pose & lightning are perfect IMHO). And third and least important, you need a white backdrop and a high key tut as some readers said.
Make sure you have a good base, it already starts with a good exposure, so in this case slightly overexposed (moves the white further white)...you don't get souch nice results only with Photoshop. Just like analogue films it's all in your base
make sure the backdrop doesn't flare by the way so make sure the background is max +1 stop than foreground (for digital camer'as, for analogue it can go up to max +2, depending on what type of film)
to give it a finishing touch try to maintain detail in the pure white bits
make always sure that there are black elements in your photograph to keep it fresh looking
It isn't really that difficult but technically this is a very skilled shot. To my eye, though, the composition is a bit too complex. Having said that I would have liked to have taken it.
A digital infra-red camera helps but, with good exposure and mostly curve adjustment layers, good results may be obtained.