Brooke Shields has a beauty secret she swears by - and right now, it's finally on sale. The Grande Cosmetics GrandeLASH-MD Lash Enhancing Serum is discounted during Amazon's Summer Beauty Event running now through May 10, making it the perfect time to snag the viral lash serum before it inevitably sells out. In an interview with The Strategist, Shields shared that she's been using the lash serum for years, and the results speak for themselves. "It's made such a difference," she said, noting that makeup artists constantly comment on how long her lashes look.