Natalie Portman flashed her nipple in movie Closer but almost nobody seemed to notice it till couple of days ago. I did a quick check on my Natalie Portman's collection and it turns out Zon did make a vidcap of this particular scene before but not to many people noticed Natalie's nipple slip in his collage.
Here are few pictures of Natalie's nip slip from scene in a strip club and Zon's Closer montage.