Jennifer Hudson was on hand at the Sundance Film Festival to discuss her starring role in the Alicia Keys-helmed The Inevitable Defeat of Mister and Pete.

Michael Starrbury, who is currently re-writing a Tupac biopic, penned the film, which stars Jennifer as mother and tatted-up heroin addict, "Gloria." Jeffrey Wright and Anthony Mackie co-star.

Jennifer spoke to "Access Hollywood" about the challenges of preparing for such a complicated character, as well as trying to differentiate the real world from fiction for her son David Jr.

"It was definitely a challenge," said Jennifer. "Preparing for the role I would rehearse my moments and my son would get scared of me. [He would say] 'My mommy doesn't talk to me like that,' and 'ooh, you're mean.'"
Hear what Alicia Keys had to say about the film below: