Waaaaaay back in September last year, Marc Jacobs sent models down his Marc By Marc Jacobs Spring '14 catwalk with aqua eyelids and started a total thing. The makeup trend that rides a wave of popularity every decade (PJ Harvey's rad turquoise lids on the cover of a '90s i-D magazine, your grandma's blue-lined lids in the '80s, etc. etc., insert any decade), blue eye makeup is, now more than ever, having its prime post-millennial moment. Here are the girls making us fall for their baby blues…