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Demi Moore, Instagram

Instagram

Demi Moore's girls keep her young!

The 53-year-old actress' daughter, Tallulah Willis, 22, posted on her Instagram page Thursday a photo of her mother wearing a sparkling, sleeveless black tank crop top and matching maxi skirt, golden spider and black feather necklace and signature thick-framed glasses while opening her mouth in mock astonishment.

"Mom is literal teenager," she wrote.

Moore had worn the outfit, which she also paired with pointed orange pumps, while co-hosting the M.A.C Cosmetics Zac Posen luncheon at the Ennis House in Los Angeles that day. She hung out at the event with the 35-year-old fashion designer himself, as well as actresses Gina Gershon, 53, and Selma Blair, 43.

Gina Gershon, Demi Moore, Zac Posen, Selma Blair

Dimitrios Kambouris/Getty Images for MAC Cosmetics

Tallulah Willis, Demi Moore

Instagram

Tallulah is Moore's youngest child. Her father is the actress' ex-husband Bruce Willis, 60. He and Moore are also parents to daughters Rumer Willis, 27, and Scout Willis, 24. He also shares two daughters, Mabel, 3, and Evelyn, 1, with wife Emma Willis.

Moore has herself not posted on social media since last summer but makes occasional appearances on her daughter's Instagram pages.

Earlier this month, Tallulah shares pics from her birthday celebration with her mother and sisters, during which she gave her mom a heartwarming gift of her own.