Well to me the picture looks like it has been altered. It seem like someones childish game of how many will fall for this picture. I think I have that picture in my vast Leelee collection. I have to see if it is like this one. Do not think it is.
I see the top edge of her bra in the place where the two sides of her shirt meet... but then further up and to her left, I see a side-on view of her nipple - right where I would expect it to be, given her breast shape and partial nudes/see-thrus. And this isn't the kind of view that a juvenile photoshopper would stick in.
I say nipslip, unless there's digital proof of tampering.