Blake Lively and boyfriend Penn Badgley were walking down Fifth Avenue when unbeknown to them, Lively’s nipple slipped into the sheer portion of her dress. Probably embarrassing for a mere few seconds, but I take it where I can get it. As they say, one sexy twenty-something actress’s misfortune on Fifth Avenue in NYC  is my masturbatory gain. They say that, right? Pic here, close-up here.