Talk about a transformation.
John Travolta and wife Kelly Preston are starring as infamous mob boss John Gotti and his wife, Victoria, in the new film, The Life and Death of John Gotti. ET was exclusively on set of the highly anticipated movie, directed by Entourage star Kevin Connolly, where the couple showed off their real-life chemistry.
"We have the friendship and we have the rapport, so you can see the intimacy," Preston, 53, says about their new roles.
PICS: Stars Take on Real-Life Roles
"For us to be in a movie where we're playing other people is so much fun, and that's what we kind of live for -- to have that creative experience together," Travolta adds.
Preston admits she herself was stunned at her husband's incredible performance. The 62-year-old actor plays the head of the Gambino crime family, once the largest and most powerful crime organization in the country. Gotti's flamboyant style and colorful personality made him one of the most famous mobsters ever, earning him the nickname "The Dapper Don." Gotti's son, John Jr., is one of the film's executive producers.
"I looked at him and the way he looked at me was so completely ... I felt like I was in John Gotti's arms," Preston shares. "It sent chills."
"It's amazing, and the first day when we actually got to see him walk onto set as John Gotti, and you know the fancy suit, and it's just .... it's really come to life," Connolly echoes.
Of course, Travolta is no stranger to playing real-life characters. He's nominated for an Emmy for his performance as attorney Robert Shapiro in the critically acclaimed FX show, The People v O.J. Simpson: American Crime Story.
"I think that I don't want to disappoint," Travolta says. "I mean, when I played Robert Shapiro, he was so familiar that I felt like it had to be accurate to a certain degree, in order to lure the audience in I felt. I feel the same way here, but even more so. I don't want people to think of John Travolta in this role. I want them to only think John Gotti."
Filming the movie has definitely turned into a family affair for Travolta and Preston, who brought their kids -- 16-year-old Ella Bleu and 5-year-old Ben -- to the Ohio set. Tune into ET on Monday to see how the adorable Ben is helping his famous father prepare for the role. The film is set to hit theaters in 2017.
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ET spoke with Travolta in March at the FX upfronts, when he revealed his most famous People v O.J. Simpson supporter -- actor Ethan Hawke.
"He was the most articulate, of any of the people I know, about the impact that the show had on him," Travolta told ET. "[He] thought it was like, the best thing he had ever seen. So, he impressed me the most with his verbiage."