If you've ever wondered how Brooke Shields achieves her famously bold eyebrows, you're in luck. The actress revealed the exact product she relies on to keep her brows looking lush - and it's currently marked down during the Nordstrom Anniversary Sale. Shields says in an Allure beauty video, "It's a serum. I use it at night too . . . but I also like to kind of brush up my brows a little bit with it... it helps them grow." The product in question? GrandeBROW, the cult-favorite brow-enhancing serum from Grande Cosmetics.