Another image was captioned: "Yes they're beautiful...but on the inside too."

Knowles wore a black-and-white romper with plunging neckline paired with a black lacy long jacket and fishnet tights.

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Minaj sported a tight black dress under a pink long coat. Keys, meanwhile, rocked a black leather jacket and black skinny jeans.

The "Anaconda" hitmaker also posed alongside Rihanna and shared funny pictures of them. Rihanna was seen wearing a plunging blazer paired with a matching skirt.

Madonna posted an image of her where she has been seen posing alongside Knowles, Keys and Rihanna.

The "Rebel Heart" hitmaker captioned: "Here comes the Tidal Wave!!! Who Runs The World???????? #rebelhearts."

Other celebrities in attendance included Kanye West, Jack White, Daft Punk, Deadmau5, Jason Aldean, Regine Chassagne and Win Butler.