The actress, 57, glows in a simple, bare-faced selfie posted to Instagram Wednesday.
"Doing my emails with Joe on this rainy day," she captions the post.
Stone previously told PEOPLE that moisturizing twice a day – a tip from her mom – is the secret to her glowing skin.
"My mom gave me a jar of Avon moisturizer when I was a kid, because she was an Avon woman, and told me to cleanse and moisturize morning and night, and that's what I do," she said. "That's it!"
Stone isn't shy about revealing her real self. The Basic Instinct star posed nude for Harper's Bazaar's September issue and looked absolutely stunning – though she was humble (and self-deprecating) about her striking figure.
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"If I believed that sexy was trying to be who I was when I did Basic Instinct, then we'd all be having a hard day today."