The actress disclosed Haynes’ attachment at the Toronto Film Festival, where two of her films — “Wild” and “The Good Lie” — are screening.
Witherspoon became involved with the Lee project in 2010 when it was set up at Fox 2000 with Nora Ephron writing and attached to direct. The project was put on hold after Ephron’s death in 2012.
Lee passed away in 2002 after a long career as a singer, songwriter, composer and actress. She’s best known for recording “Why Don’t You Do Right?” with Benny Goodman, “Fever” and “Is That All There Is?”
Witherspoon won an Oscar for portraying singer June Carter Cash in 2005’s “Walk the Line.”
Marc Platt, who teamed with Witherspoon on her “Legally Blonde” films, is producing. Ephron’s script was re-written by Doug Wright.
Haynes, whose credits include “Far From Heaven” and “I’m Not There,” is in post-production on romantic drama “Carol,” starring Cate Blanchett, Rooney Mara, Sarah Paulson and Kyle Chandler.
He is repped by CAA and attorney John Sloss.