"There's gonna be the intrigued pre-teens that are gonna want to sneak in and see the movie, and that's obviously something I can't control."
Many of Selena's fans will be too young to see the film, which includes graphic scenes of sex, violence and drug taking.
She has told US reporters: "There's gonna be the intrigued pre-teens that are gonna want to sneak in and see the movie, and that's obviously something I can't control."
She added: "[I can] definitely warn them as best I can, but the movie is rated R, and it's kind of a given when you see the trailer that you should be old enough to see the movie."
In the film, Justin Bieber’s ex-girlfriend stars as one of four college friends who are sucked into a bizarre world of sex and drugs by rapper and gangster played by James Franco. Directed by Harmony Korine, the movie follows the girls as they turn to crime to fund their spring vacation.
For its young stars Selena Gomez, Vanessa Hudgens and Ashley Benson, who star alongside Korine's wife Rachel as the four female protagonists, it is stark difference from their previous squeaky clean personas.
The movie follows the girls as they turn to crime to fund their spring vacation
The former Disney channel actress also revealed that Franco's turn as seedy drug-dealer Alien also "creeped" her out on set because the Oz The Great And Powerful actor kept in character between takes.
Selena Gomez's raunchy R-rated movie, which has already cleaned up at the box-office in the US, will be released in the UK on April 5.