Chastain was always a pretty solid guess when it came to adult Beverly. After all, she worked with It director Andy Muschietti on the 2013 horror film Mama.
It's been a while since the It sequel was confirmed (and titled It: Chapter Two), and there are a lot of things to figure out before the next part of the story
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IT Chapter 2: Jessica Chastain Starts Filming as Beverly Marsh
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IT Chapter 2, Stephen King's IT Wiki
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IT Chapter 2: Jessica Chastain Starts Filming as Beverly Marsh
Congratulations, Internet: Jessica Chastain Might Star in the It Sequel
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Jessica Chastain demanded more blood and gore for IT Chapter 2
Jessica Chastain - Wikipedia
Jessica Chastain - Wikipedia
It Chapter Two, The JH Movie Collection's Official Wiki
Jessica Chastain demanded more blood and gore for IT Chapter 2
IT Chapter 2: Jessica Chastain Starts Filming as Beverly Marsh