The tween queen is all grown up now, and getting racy in lingerie for her latest movie role!

In her new movie, Miley Cyrus plays a private detective for the FBI who goes undercover in a sorority house to guard a mobster’s daughter. The plot sounds pretty flimsy, but in these new stills from “So Undercover,” the former Disney star can be seen in just a cleavage-baring bra and boxer shorts that show the 18-year-old has come a long way from “Hannah Montana!” Will be old fans accept the adult Miley? We’ll find out when the film hits theaters this summer.