Aoki’s representative confirmed the news to the New York Post.
"Devon and James are extremely happy. They became engaged over the summer, and she has just found out she is pregnant," the spokesperson said.
They added: "She just finished filming Rosencrantz And Guildenstern Are Undead, so she'll probably take a break because of her pregnancy."
The 28-year-old has appeared in the films Sin City and 2 Fast 2 Furious.
She is the daughter of former Olympic wrestler Hiroaki Aoki, who founded the Benihana restaurant chain.
