The picture showed the "Diamonds" hitmaker pointing a pink gun as her face looked focused.
Wearing a green oversized jacket, Rihanna looked stunning with her red hair down while carrying a black leather bag.
The pink gun she carried on the picture, however, looked like a drill as it had drill bits-like stuff on its muzzle.
The 27-year-old singer apparently wanted to show that she could go wild if she was brainwashed. She captioned the picture, "brainwashed."
The photo was posted on the same day as her full-length Dior campaign video was released. The campaign video, called "Secret Garden IV", went viral on the internet and it has attracted nearly 200,000 viewers on YouTube.