Billie Eilish's Go-To Lip Liner Stain Taught Me to Trust the Process (2025)

Billie Eilish is undeniably one of the biggest pop stars of the moment, especially among younger generations. While her haunting vocals and poetic lyricism have won her many an award, she's arguably just as iconic for her fashion and beauty looks, which blend wearable classics with unexpected subversive details for an edgy-yet-irresistible "weird girl" feel. From her lime green roots to her blonde bombshell era to the subtle ways she accentuates her "sanpaku eyes," the star is constantly pushing boundaries and inspiring her legions of fans to do the same.

Now, the "Birds of a Feather" singer is having one of her most direct moments of beauty influence yet, thanks to her recent reveal of the lip combo she's been using on tour. Her routine's starring product is the Sacheu Lip Liner Stay-n, which is meant for you to leave on for 10-20 minutes before peeling the film to reveal a (hopefully) long-lasting tint.

An endorsement like Eilish's carries a lot of weight given the high-energy nature of her shows, so I was excited to see if the formula would deliver for my own busy schedule as a fashion and beauty editor. (And—spoiler alert—it did, both for an initial trial run at a swanky hotel party and in my all-day test a week later.) Ahead, learn all you need to know about the star's viral go-to lip liner stain, plus my honest thoughts.

The Lip Liner Stain

Sacheu launched its Lip Liner Stay-n in 2023, at a moment when it felt like everyone was searching for the perfect lip combo. The product quickly gained traction for its unique, multi-step application experience: You start by tracing the outline of your lips with the applicator before letting the product dry for 10-20 minutes, then peel the resulting film to reveal the stain, which you can wear on its own or paired with your gloss, balm, or lipstick of choice. From there, the brand says the smudge and transfer-proof, water-resistant formula has the potential to last up to 12 hours, leaving your lip look intact throughout your full day of activities.

The formula includes hyaluronic acid and vitamin E for conditioning benefits, which is welcome news for anyone with dry lips as the brand advises not applying any lip balms or oils beforehand, lest the liner won't stick as promised. The lid twists open to reveal a straight, fairly rigid applicator, which is helpful to precisely outline your lips.

Billie Eilish's Routine

In her viral pre-tour glam TikTok, Eilish famously used the Sacheu Lip Liner Stay-n as the first step in her lip routine. The video shows her applying a substantial layer of rosy shade P-Inked around the border of her lips before cutting to her gently stretching her mouth to release the film, which she peels to reveal a subtle tint before intensifying the look with Tower 28's OneLiner in Work of Art. The result is a dramatic contrast fitting of the pop star's edgy aesthetic, but you can also follow it with any products of your choosing—so think of it as a longer-lasting take on the liner step of your go-to lip combo.

When I decided to try the liner, the shades came in a few shipments, the first of which—taupe shade cLover—arrived before I was attending a party at a luxury hotel penthouse. In need of a makeup look that felt special (and intrigued to see whether the stain really worked), I tried it out right then, paired with the Gucci Hydrating Plumping Lip Gloss in Suzane Brown. Once I trusted the process of letting it dry, the result had just the right amount of wearable drama, and it looked great all night—with no reapplication of the liner needed. This quick test-drive had me excited to see how the viral product would perform over a longer period.

My Review

9:30 AM

I just applied the Lip Liner Stay-n in shade 00, LeftOnRed. Given I usually apply my lip products right before running out the door, I will be allowing it to set while taking a car to my first event of the day. It looks a little chaotic, but the formula feels pretty dry within a minute or two, so I feel confident that it will do its job without transferring as I let it set on the move.

10:00 AM

I've peeled off the film to reveal a vivid red tint, just as the shade would suggest. I paired it with Pat McGrath's Lust Gloss in shade Blood 2. A sheer red, it's a great match for the liner but not currently available—for a similar vibe, I'd try the Kosas Wet Lip Oil in Jaws or the Ami Colé Hydrating Lip Treatment Oil in Romance.

11:00 AM

I arrive after the office after stopping by a press preview, where I enjoyed coffee and a croissant while perusing the spring collection. I needed to reapply the gloss after that, but the liner was perfectly intact.

2:30 PM

In desperate need of some more caffeine and a bit of lunch (which, as you may know, also happens to be one of Eilish's hit songs), I pop out to the food court near my office. I've been in a few meetings, and I haven't reapplied any products. The gloss has faded a bit but is still intact, and the lip liner stain hasn't budged.

6:30 PM

I've just left the office at golden hour before heading to an evening event. It's been a few hours since I reapplied any gloss, and the liner stain is still the same application from the morning. It has faded a bit, but is still decidedly there—which already makes it a standout in comparison to most liners I've tried, which I typically reapply almost as often as the products I pair them with.

9:00 PM

We're almost at the 12 hour mark, which is how long Sacheu says the product has the potential to last. Freshly home from my evening event, I've enjoyed a cocktail and some hors d'oeuvres (plus accumulated a few celestial temporary tattoos that you might have noticed if you're eagle-eyed). I stopped reapplying any products for the night hours ago, and as you can see, the liner is still visible after only applying it once that morning. I'd consider this experiment a success.