The 25-year-old actress, who played Anastasia Steele in the first part, revealed the filming date of "Fifty Shades Darker" on the Ellen DeGeneres show, reported Us magazine.
She said the shooting for the second film will begin "sometime in the new year."
The franchise is the adaptation of author EL James' best-seller series of the same name. James' husband, Niall Leonard, writes the script with Michael De Luca, Dana Brunetti and James tapped as producers.
James Foley has replaced director Sam Taylor-Johnson, who helmed the first part.