8 Reasons '80s Beauty Trends Are Back in a Big Way

The trend: Side ponytails

The reference: Young Stephanie Tanner from Full House

Proof it's back: When the queen of the music business shows up at the most fashion-forward event in Hollywood (the Met Gala) wearing a high side ponytail, you know it's en vogue.

How to make it modern: Instead of a poufy side pony, Beyoncé wore it slicked back with of-the-moment curling-iron waves at the tail.