Hudson plays a Broadway diva in the new season of TV series Smash, and also recorded scenes for upcoming film The Inevitable Defeat of Mister and Pete.
She told E! Online about appearing in Smash: "It was a lot of fun but also a lot of work. You're singing, you're acting, you're in the studio recording, you're learning dance steps and then it was like - oh, my God! - they'll change things right there on the set…It was a challenge."
Hudson said that she also found it tough playing a drug addict in The Inevitable Defeat of Mister and Pete. She met with real-life addicts to prepare for the role, even hiring one young woman as an on-set consultant.
She continued: "If you're going to go for it, you go for it. It was so interesting because I was completely introduced to a world I didn't know. And I was literally in the process of shooting Smash. I was this glamorous character with all the hair and all the make-up and gowns, and then the next day, I was in tattoos and crazy hair and in this complete rawness."
The star added: "What I love most about this project is it has allowed me to step outside the box. This industry will put you in a box. 'Jennifer Hudson, sing! Do a musical!' It's like, no! There's so much more I want to do and there's so much more I feel like I could do.
"But it's not that often you get those opportunities. So that's why when this came along I was like, 'I'm in. Even though I'm terrified, I'm all in'."