Sienna Miller Says This New Highlighter Is Like a Five-Second Facial

Sienna Miller has a newborn, a packed schedule and—somehow—glowing skin. Her secret is exactly what you’d hope: a single stick she swipes on in the back of a car.

The product is the new Charlotte Tilbury Unreal Highlighter Fresh, Healthy Glow Stick ($44), and besides being a brand spokesperson, Miller is already devoted to it. “It’s unlike any highlighter I’ve used before—no mirror, no brushes, you just swipe it on, tap it in and you’re done,” she says. “It’s like a five-second facial, as if my skin’s just had a big drink of water.”

The appeal is real. The balm-texture formula uses Charlotte’s Glow-Light Mapping Mesh Technology to diffuse and reflect light for what the brand calls a “soft-focus, lit-from-within finish.” The universally flattering champagne shade works across all skin tones and layers over (or under) makeup without budging.

For Miller, the speed is the selling point. “I’m quite low-maintenance when it comes to my beauty routine—especially at the moment, with a newborn—so anything that’s quick and easy is a dream,” she says. “I’ll do it in the back of a car or while I’m half out the door. It just gives my skin that fresh, slightly glossy look, like I’ve had more sleep than I have.”

She wears it as part of a minimal Tilbury stack: first, the Unreal Skin Foundation Stick ($48), what she calls “the ‘no-foundation foundation’ that evens everything out without feeling like makeup.” She follows with a touch of blush and the new highlighter on top. “It all just melts together really naturally,” Miller says. “The perfect glowing summer skin.”