At the Met Gala earlier this month, Sienna Miller stepped out sporting a lighter hue that gives her hair that perfect, beachy feel. And if you want to try out the style yourself, we've got the scoop from her colorist, Marie Robinson, on the whole how-to.

If you have naturally medium-brown to medium-blond hair, try using an at-home hair lightening kit to re-create Sienna's highlights. Start an inch away from the face and use a clean mascara wand to dip and saturate the hair color, then pull through on strands of hair. According to Marie, you'll then want to "make sure the wand is saturated again with lightening product and pull through random strands from mid-length to ends." Next, let it process as directed. Voila! Easy styling for a face-brightening, no-fuss look.