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The easiest way to mimic these fluffy arches is using a chubby brow pencil like the new MAC Cosmetics Big Brow Pencil ($21, available in five shades). "It creates an unstructured, full brow so they look a little more volumized and fuller, but still natural," explained Roberts.

Don't worry about going overboard and drawing on arches that look more "Sharpie" than sharp. Even though the stylus is large, the color is very buildable, so it'll go on smoothly.