The three stars appear in the Oscar-nominated film, helping to explain the complicated investment system that led the 2008 financial crisis. "There's a lot to try to understand; it's a complicated world," Steve Carell explains in a behind-the-scenes look at making the film. "But to have these celebrities as themselves explain it to you, somehow makes it more palatable."
"What I love about what they're doing here is that they're finding ways to explain it to people -- myself included -- will understand everything that's going on," Gomez says.
In the film, Gomez appears on-screen at a Las Vegas blackjack table to explain how a synthetic CDO works. The scene comes at a pivotal moment where Carell's character, Mark Baum, comes to understand just how big of trouble the financial system is in while talking to Mr. Chau (Bryon Mann).
The scene is also a particular favorite of director Adam McKay, who explained to ET how editor Hank Corwin created pure magic on screen.
"[At that moment] we freeze and we go to the Guns N' Roses song and then we cut to Selena Gomez and we cut back. I remember when he showed me that I was like, 'Oh my God! I'm working with a high, high level editor at this point,'" McKay gushed at the American Cinema Editors Awards.
In addition to winning Best Edited Feature Film at the ACE Awards, The Big Short is also nominated for five Academy Awards, including Best Picture, Best Director and Best Film Editing.
The Big Short is now available on Digital HD and will be available on Blu-ray on March 15.