On May 21, Delevingne stunned on the red carpet in Cannes with a dramatically dark hair color, a shag cut, and blunt bangs — ...

This blue-black hair has double the blue: gun-metal blue in the base, and bright navy streaks in the top layer, all perfectly—and, ahem, expertly—blended together for a truly gorgeous finish.

How to cover grey streaks naturally ... Black tea rinse Black tea helps darken your hair and gives it a natural shine. Take 2 tablespoons of black tea leaves and add 1 cup of water.