The black-and-white image finds Kardashian sipping on a bottle of champagne while Montana holds a gun.
"About to go gucci maaannnnnn. #MovieSet #JustDifferent @frenchmontana," Kardashian captioned the photo.
The image comes after months of speculation that the 29-year-old reality star is dating the rapper. While the two have yet to address the rumors, Kardashian's mom Kris Jenner told E! News in May that the two were "just friends."
"They're hanging out," Jenner said of the duo's multiple outings.