The 34-year-old American actress stars in the psychological thriller alongside Hollywood greats Robert De Niro and Edward Norton.
Milla, also a musician and fashion designer, confessed to being in awe of her two charismatic and much-famed co-stars.
"I cried when they told me I'd got it,” she told the New York Post. “I was so happy that I was able to share more with these two icons.”
Stone tells the story of a ruthless convict’s disturbing mental games with his correctional officer as he tries to get parole. When the officer begins an affair with the convict’s wife, things get even uglier.
Milla describes the film as “intense” and said that sometime she didn’t even dare to bring her two-year-old daughter Ever onto set she was so concerned about the effect of the unfolding drama.
"You don't get scripts like this every day,” Milla said. “I get to do my little comedies, my big action films, but this movie is very special... There were quite a few days on set that I wouldn't bring my baby and I'd come home in tears, it was so intense."
Milla has also starred in The Million Dollar Hotel and Zoolander.