Throughout the years, there have been some women who time and time again have inspired hairstyles for cool girls everywhere.  Some of them had signature styles, while others managed to make almost anything look effortlessly perfect, which is why we all coveted their styles and tried them for ourselves.

So here, from Allure.com is a list of the top 20 cool girl hair icons, providing a great look back at some of the styles and women who have influenced hair trends for decades.

Who are your favorite hair icons from the list, and who got snubbed?