The photo shows Delevingne wearing a black-and-blue sweater and high-waisted blue pants. She looks away from the camera while holding a glass with one hand and showing off a diamond ring on the finger.
It's a vintage-inspired ring with several tiny diamonds and a blue sapphire.
The mentioned snap was posted on Instagram by her "Suicide Squad" co-star Jared Leto, reported Aceshowbiz.
The sparkler appeared to be the same one she first sported while attending Chanel's spring 2016 show last October with Vincent, whose real name is Annie Clark.