When we learned to play the recorder (aka the world's lamest musical instrument) in middle school, the first song we were taught happened to be "Hot Cross Buns." Incidentally, that's pretty much the only way we can describe what's going on atop Björk, Gwen Stefani and Kaley Cuoco's heads above. We get that sleeping with your hair into tiny, tight twists yields cool waves come morning, but why would these ladies leave the house with those nutty knots still in place? You wouldn't walk around town with your hair still in hot rollers, would you? Case closed.