Charli XCX: Always take rose water with you to a festival because it's freshening. It’s quick and softening and feels really good when you spray it on. It’s a quick fix because sometimes if I’m partying at a festival and don’t want to do a full skin look, it just freshens me up. I got one from Urban Outfitters that I really like: a rose water mist. Another Do: I think you have to go down the glitter road for festivals, especially if you don’t normally wear it. It’s a good opportunity to just go full-out club kid mode and throw glitter all over your body. If you can find a roll-on like you had in the '90s, that’s a yes.

As for Dont's, I’m not really into the fake tattoo arm band thing—the gold ones. It’s not my style but it works for some people. I don’t love Aztec print tattoos. And I also think floral headbands are a thing of the past.

Lipstick: Feel you there. If you could replace the floral crown for good with any hair trend, what would it be?

Charli XCX: I think big crazy hair at festivals is the best because it's only going to get better the more you party. And I feel like most people don’t shower at festivals in the U.K. Not Coachella, everyone there is super glam from what I've heard. I’ve never actually been, but I might go this year. It's still TBD.

Lipstick: You've done the festival scene all over. How is it different in London compared to the States?

Charli XCX: It’s always hotter at U.S. festivals, and in the U.K. it always rains, so mud becomes a makeup tool there. People roll around in mud the whole time. In the U.K. everyone is just dirtier at a festival.

Lipstick: Speaking of that, you are the QUEEN of messy hair—it always looks messy in just the right kind of way. What's your secret?

Charli XCX: My hair is already pretty messy anyway, so if I use a sea salt spray it goes full crazy. For me, I like a good hairspray and dry shampoo. I don’t really use a lot on my hair, I let it do it’s own thing I suppose.

Lipstick: You're definitely a makeup girl. You're known for your eyeliner and your red lip. But if you had to narrow down one thing that's your signature, what would it be?

Charli XCX: Definitely a winged eyeliner. That’s something I’ve been doing since I was 14 years old. It always looks really good onstage and in daily life, so it’s multifunctional for me.

Lipstick: What made you so obsessed with it?

Charli XCX: It was when I first got into Brigitte Bardot and Sophia Loren, those girls always had an amazing eyeliner look. Also I think I was tired of trying to make eyeshadow work for me as a young girl. I couldn’t really get it to work out for me. It would get all over my face, so I think when it came to eyeliner that was about precision, it was so much better.

Lipstick: Do you have any hacks for getting the perfect wing?

Charli XCX: Oh, wow, I’ve just been doing it for so long it just kind of...happens. If makeup artists are doing an intense graphic line I’ve seen them use tape, but I don't do that. That just confuses me. The technique is like a reflex now. I don't understand eyeshadow or where you’re meant to put it, I don’t get the shading aspect at all. But eyeliner I can do.