Lauren Graham will always be the ultimate cool mom, Lorelai Gilmore, from Gilmore Girls. And just like her popular character, she never seems to age. In a recent Instagram post, the actress revealed her secret to youthful skin: A $28 drugstore serum that's packed with collagen - aka the secret to glowing skin. Graham, a L'Oréal Paris partner, said on Instagram that she is "such a fan" of the L'Oréal Paris Age Perfect Le Duo Serum, which is new on Walmart for $28. "It looks and feels really nice," she added. See it! Get the L'Oreal Paris Age Perfect Le Duo Serum for $28 at Walmart! From firming skin to reducing fine lines and wrinkles, this serum is packed with collagen peptides that promote cell renewal, as well as a combination of vitamins B3 and C to reduce signs of aging, boost radiance and even skin tone. Together, the serum makes skin feel smoother in just a few weeks. L'Oreal reports that users "experience increased tone evenness, plumpness, radiance and firmness." Martha Stewart and Heidi Klum's Secret to a Healthy, Youthful Glow Costs Just $15 Everyday shoppers also praise the serum and its benefits. "This serum is amazing!" one Walmart shopper said. "It goes on so smooth and feels so weightless once it's applied. My skin looks and feels great. It has a slight scent but nothing too noticeable. The packaging is pretty and I love the ingredients. Will definitely be a new go to!" "I am absolutely in love with this serum," another fan wrote. "My wrinkles have begun to tighten up. My skin is visibly smooth, so soft and bright. I don't mind scented products as long as it's not strong. This has a very soft pleasant smell. I will definitely continue using this as it's working for me so far!" If the current serums in your lineup aren't producing results, toss them out and give this Graham-approved serum a try. See it! Get the L'Oreal Paris Age Perfect Le Duo Serum for $28 at Walmart! Shoppers Are Comparing This $30 Anti-Aging Face Cream to Moisturizers 3x the Cost Us Weekly has affiliate partnerships. We receive compensation when you click on a link and make a purchase. Learn more!