The 35-year-old actress roughs up her 31-year-old beau in a sleazy hotel room while posing as a prostitute in their upcoming film, Midnight In The Switchgrass.
In the first trailer for the highly-anticipated movie, Fox looks unbelievable wearing a leather pleated skirt with a latex bodysuit.
Flaunting her mouth-watering body, the star added inches to her tiny 5'4" frame in a pair of crystal stripper-like heels.
Fox -- who plays detective Rebecca Lombardi in the Randall Emmett film -- poses as a call girl in an attempt to find a killer who is targeting prostitutes.
MGK seemingly plays a pimp with inside information about the crimes.
He's seen taking charge of Fox in the trailer but the tables quickly turn.
Walking into the hotel room, MGK's character grabs his real-life girlfriend's face while whispering into her ear, "You belong to me. You understand what I'm saying?"
He's then seen tracing his fingers down her nearly-naked body while ordering her to "lift up that skirt."
That's when the detective's training kicks in.
Replying, "no" before struggling with MGK's character -- who comes at her with a knife -- Fox shows her real-life boyfriend who's boss.
It doesn't take long for Detective Rebecca to get the pimp on the floor and demanding answers.
Tying up a bloody MGK, Fox's character grabs her gun and puts it to his head.
"Who was he?" she demands to know. "He tried to cuff one of my girls," he responds before dropping an important detail that the suspected killer has a "lightening bolt on his truck."
Fox and MGK aren't the only super famous faces in the trailer.
The movie also features Bruce Willis, Emile Hirsch, Jackie Cruz, Lukas Haas, and so many more.
Ironically, the duo began filming in July 2020, less than two months after they were first linked.
When the romance rumors began, fans were shocked because everyone thought she was still happily married to Brian Austin Green.
Weeks later, the 90210 actor revealed they had split. Fox filed for divorce in November, which gave her the green light to go full steam ahead with Machine Gun Kelly.