Celebrity Nipple Slips and the Flash Effect
Many of today's celebrity "nipple slips" are caused by something we call the "flash effect". At first no nudity is revealed, but when the celebrity hits the red carpet and the flash bulbs start popping - uh-oh, your dress is see-through! Click to enlarge, NSFW...

Previously:
Celebrity Boobs in Full Color
Celebrity Nipple Slips & Upskirts