If you purchase an independently reviewed product or service through a link on our website, Rolling Stone may receive an affiliate commission. We already know that girl group KATSEYE can command a stage, sing with incredible ability, and even turn skeptics into “EYEKONS” (the name for their devoted fan base). But there’s one thing we didn’t see coming: the pop sensations are also marketing geniuses. After their viral Gap Jeans ad earlier this fall, (their Milkshake brought the entire internet