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

To cleanse her skin between performances, Marina relies on the Peter Thomas Roth Pumpkin Enzyme Mask ($58) twice a week. "It’s like a resurfacer," she enthused.

She also makes sure to take off her makeup every night and follows with argan oil in the morning. "I don't moisturize at night. I only moisturize in the morning," she said. "It's not good to moisturize at night because that's the only time your skin has a proper chance to breathe without being exposed to dirt and pollution."