Okay, this might be a long shot, or wishful thinking, or just some weird optical illusion, but is it just me, or does it actually look like Rachel Bilson has a nipple ring? Maybe I'm crazy, but I'm pretty sure it's there. And if it is there, that makes Rachel Bilson a much kinkier girl than I ever gave her credit for.
If you click on the thumbnails below, and examine the big pictures carefully, you will see some kind of reflection shining through Rachel's black dress over where her right nipple should be. The reflection appears to be a ball shape, attached to a faint ring shape. The side of the ring opposite the ball appears to be missing, as if it's obscured by something.
So, does Rachel Bilson have a nipple ring? I think the only way to know for sure is if she shows us...
Note: To help in the investigation, the large images have not been compressed. They are very hi-res, and the file sizes are very large.