Heidi Klum Goes Nude, Wears Just Body Paint in Ad

That's one way to sell lipstick!

Heidi Klum is now a 38-year-old single mom of four kids -- but her world-famous bod looks as flawless as ever.

As the face of European cosmetic brand Astor, the "Project Runway" host went totally nude for a brand-new ad, wearing just elaborate body paint as she reclines and gives the camera a come-hither look.

PHOTOS: Heidi's incredible body

"I had another fun photo shoot for Astor celebrating color!" Klum tweeted, sharing the super-sexy photo with fans.

Last week, Klum shocked fans with a different kind of modeling shot: She shared a 1992 photo, one of her first modeling shots, at age 19, in which she sported long brown hair and wore a yellow prom dress. The German stunner shares kids Leni, 7, Henry, 6, Johan, 5, and Lou, 2 with estranged husband Seal; after announcing their separation in January, both Klum and Seal, 49, filed divorce papers earlier this month.

PHOTOS: Heidi and Seal in happier times

"Sometimes life throws you a curveball, and then you just figure it out and deal with it," she told Allure last month of the split. "But my dream always was that – to have the perfect family and have lots of children and a beautiful garden and trampolines and swings and things."

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