Lily Allen Nipple, Make That, Boob Slip Pictures

You know, I walk down the street all the time, and while I pass some very good looking women, not one of them has ever had a nipple pop out of her shirt, let alone a whole breast. So how do moments like these Lily Allen nipple slip pictures keep happening to all these celebrities? Could it be that they're doing it on purpose? And more importantly, how come this is the one celebrity trend that hasn't been picked up by all those girls on the street?

And yes, it does look like she's tweeking her nipple in a couple shots.

Photo credit: bauergriffinonline.com / Splash News