He shared footage of the star modeling her dress and wrote, "When the swan goes to the Black and White Ball. @demimoore stuns ... wore a custom, mermaid black dress by Rodarte and Calista ...

I'm old enough to remember the first "Little Mermaid" from back in '89 and to know that Disney princesses were historically white ... little Black girls in red wigs and mermaid dresses snapped ...

The black-and-white stripes that covered the off ... fashion house's spring 1987 collection. The strapless dress had a body-hugging mermaid silhouette and featured a drape detailing at the waist ...

The Juice hitmaker, 37, showed off her weight loss as she wowed in a figure-hugging black and white mermaid ... in the tight dress which then featured an exaggerated white skirt tail.