Based on a true story, Freeheld will star Moore as Page's same-sex partner, a New Jersey police detective who was unable to assign her pension benefits to her partner after being diagnosed with terminal cancer.
The Oscar nominee's casting was announced the day after Page came out at a conference for LGBT youth.
"It was really wonderful," Moore told me about Page's speech when I caught up with her at the premiere of Non-Stop (in theaters on Feb. 28). "I was very happy for her."
She added about the film, "It's great. I'm excited about it."
Page made the brave speech at the Human Right Campaign's Time to THRIVE at Bally's Hotel and Casino in Las Vegas.
"I'm here today because I am gay," Page said to the crowd. "And because maybe I can make a difference. To help others have an easier and more hopeful time. Regardless, for me, I feel a personal obligation and a social responsibility."
The Juno star made also shared that she faced an inner struggle because she was also in the Hollywood spotlight.
"It's weird because here I am, an actress, representing—at least in some sense—an industry that places crushing standards on all of us," Page said. "Not just young people, but everyone. Standards of beauty. Of a good life. Of success. Standards that, I hate to admit, have affected me."
"You have ideas planted in your head, thoughts you never had before, that tell you how you have to act, how you have to dress and who you have to be. I have been trying to push back, to be authentic, to follow my heart, but it can be hard," she admitted.
Page told E! News back in January 2013 that Freeheld was her "dream" project.
It's nice to see her dream coming true.