Miley Cyrus, So Undercover (Photo : Warner Bros.)

Miley Cyrus is "So Undercover" in her latest film. The trailer for this Warner Bros. picture was released on Saturday and it reveals Miley Cyrus in a sexy scene, holding a gun, and under going a make-over to blend in as a sorority girl at a privileged university.

"So Undercover" features Miley Cyrus as Molly, a street smart private investigator who is hired by the FBI to protect the daughter of a past mobster. Also in the film is Jeremy Piven, Molly Park, Joshua Bowman, Autumn Reeser, and Kelly Osbourne.

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The action-comedy is the Cyrus' first film after months of controversial Twitter posts, risque pictures, and an engagement to Liam Hemsworth.

Miley Cyrus recently made an appearance on the "Tonight Show" where she dished about her on-screen romance on "Two and a Half Men." The actress guest stars as the lively character, Missi, who is the love interest of Jake, played by Angus T. Jones, 19.

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"It was kind of weird, because when I was doing it, there's like the prop guys, and all these people, and they're like, 'Do you have your ring on?'" Cyrus said of her love scenes with Jones.

"This feels weird, [to] take off my ring and make out with Angus - this is creepy!" she laughed, noting her shock at how much the actor has grown up since being a child star. "He's coming back from the military in the episode, and you kind of put a man in a suit, he had a shaved head - he kind of looked good!"

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Catch Miley Cyrus in "So Undercover," in theatres Dec. 7. And her guest appearance on "Two and a Half Men" on Oct. 18 on CBS.

Check out the "So Undercover" trailer:

Check out a sneak peak of Miley Cyrus on "Two and a Half Men":