AceShowbiz -

Kristen Stewart shows her free-spirited side in a new trailer for "On the Road". Married at 16 years old, Stewart's character is featured embarking on a wild journey with her ex-con husband and an aspiring writer. She can be seen doing some daring actions such as having a threesome with the two men, as well as dancing seductively at a jazz club.

Stewart plays Marylou, who is a far cry from her signature Bella Swan image from the "Twilight Saga" film series. Marylou, who has an affinity for sex and marijuana, meets New York writer Sal Paradise who decides to have a road trip soon after the death of his father.

Determined to avoid the pitfalls of a narrow, prescribed life, Paradise joins Marylou and her husband Dean Moriarty on what evolves into a life-changing physical and emotional odyssey. Thirsting for freedom, they discover the world, the ecstasy of experience, the connectedness of humanity, and ultimately themselves.

An adaptation from a novel by famous Beat generation poet Jack Kerouac, "On the Road" is directed by Walter Salles with Jose Rivera penning the script. Joining Stewart in the cast ensemble are Garrett Hedlund, Sam Riley, Kirsten Dunst, Viggo Mortensen, Amy Adams and Tom Sturridge.

Stewart once revealed that the upcoming film would feature herself nude. "It's kind of insane to watch now. I'm like, 'Who is that?' But I think - as every actress says when they do this is - it just felt so right," so she told MTV when discussing the explicit scenes. She added that she never regretted playing a sexually promiscuous character, stating, "I have kind of no qualms about it either. I think people are a little uptight."

"On the Road" will be released in the U.S. on December 21. The drama was first screened at the 2012 Cannes Film Festival, where Stewart was supported by Robert Pattinson during the premiere event.