Copy Marina and the Diamonds' Easy, Girlie Festival Hair Bow

The star likes to look into the past to pull makeup inspiration — she's particularly partial to the '70s. "I enjoy referencing old looks but updating them in a modern way," she explained. "For example, I will team a neon flicker eyeliner or a neon eye shadow with very natural, voluminous '70s hair."

When it comes to creating a cat eye, she opts for Alexa Chung's chosen liner — the Eyeko Eye Do Lash Enhancing Liquid Eyeliner ($19). "You have to look at the shape of your eye and follow that to achieve a cat eye that's actually going to look good on you," she advised.