First came oil slick hair and nails, and now oil slick lips are the latest beauty trend taking Instagram by storm. This look - also called holographic or mermaid lips - is achieved by taking metallic shades of purple, green, pink, blue and grey makeup, mostly eye shadows, and mixing them together on lips to create a petrol effect, according to Seventeen magazine. For a super oil slick look, some are even adding clear gloss on top. The results are fascinating and beautiful!

Most of the looks start with a black or dark-colored base and then the other bright colors are loaded on in layers in the center, according to the Daily Mail. The hashtag #oilslicklips is what's being used for the trend, and the photos beauty addicts are posting are mesmerizing.

It's unclear who started the oil slick lip trend, but last year, New York-based hair colorist Aura Friedman created petrol hair, which sparked the trend as a whole. For the oil slick hair, she used a similar technique as the lips by weaving different colors - like purple, blue and green - through the strands on a dark, inky base.

"I've been trying to recreate gasoline or oil when it's on the ground and it rains," she told PopSugar in September. "I find that when you take a dark purple and a dark green and layer them one on top of the other, you end up with this iridescent feeling."