Paltrow's picture was posted by Stella McCartney's profile as the 40-year-old actress was modeling one of the pieces from the designer's swimwear collection.
In the photo, the "Iron Man" star flaunts her "22-year-old stripper" behind as she jumps in a garden wearing a one-shouldered snakeskin-print bikini and no makeup.
"Sexy lady in Stella swimwear! Summer never stop! x Stella," the designer captioned the image.
Paltrow also showed some skin in the latest trailer for her upcoming film "Thanks for Sharing," in which she falls in love with a recovering alcoholic played by Mark Ruffalo.