March 14 has come to be known, colloquially, as Pi Day because its numerical representation 3.14 is the same as the first three digits of the legendary number known as Pi. This year on Pi Day, we're celebrating women who have shown off their hair pies on film by offering up a helping of hair pie on Pi Day! From the full and fabulous to the bushy and bold, these babes have cultivated a sweet thatch of hair to accompany their lady business, and we couldn't be happier about it! Happy (Hair) Pi Day, everybody!