The daughter of Bruce Willis and Demi Moore chose a slinky, flimsy nude-coloured gown for the Impossible 8x8 exhibition private viewing on Thursday evening (19 February).
We're not sure whether she intended to show so much flesh or whether it was the effect of the cameras… though it wouldn't be a surprise if she planned it.
Scout famously posted topless pictures to Instagram last year in a protest against social media censorship of nipples and pictures of nudity.
The 22-year-old shared images of herself walking through New York with no shirt or bra on and launched the hashtag #FreeTheNipple.
She claimed: "I am not trying to argue for mandatory toplessness, or even bralessness. What I am arguing for is a woman's right to choose how she represents her body - and to make that choice based on personal desire and not a fear of how people will react to her or how society will judge her. No woman should be made to feel ashamed of her body."
The 8x8 exhibition features the work of eight artists from the US and Europe, including Scout. Each artist was challenged to create eight pictures. Scout chose to focus on "intimacy and youthful sexuality" in her art.
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