Hudson, who won an Oscar for her role in 2006's Dreamgirls, revealed that Franklin handpicked her to star in the story about her life.
"She's an iconic figure that we all love and respect and admire," Hudson said, recalling Franklin came to see her in a production of The Color Purple. "She called me and she was like, 'I made my decision, and it is you I want to play me. But don't you tell anyone.'"
"'Ma'am, I won't say a thing. I'll do whatever you tell me to do,'" she replied, adding of the casting, "I'm still in shock."