The 40-year-old star did not reveal her character's identity but she said she is not going to portray the Empress of the Shi'ar Empire, reported Contactmusic.
In the comments section of an Instagram post, in which she expressed her excitement at seeing a rainbow on the first day of principal photography for the movie, she wrote, "Hey folks, want a scoop? I am not playing Lilandra (sic)."
The news comes after Chastain teased she would be playing an important, villainous role in the upcoming film after she told co-star James Franco that she would make him cry on set.
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