Jessica Chastain shows the Other Mommy smile in Jimmy Kimmel Live segment
Jessica Chastain showed how she makes the creepy Other Mommy smile in Jimmy Kimmel Live, per IGN.
What happened
IGN reported on October 8, 2026 that Jessica Chastain explained how she built the painful, unnatural smile for Other Mommy. In the segment description, the smile is tied to physical tension, as if someone is holding something heavy while still trying to smile. The source focuses on how the expression is constructed, not just how it looks on screen.
Jimmy Kimmel Live posted the video "Jessica Chastain Teaches Jimmy Kimmel How to Do the Other Mommy Creepy Smile" the same day. In the video description, Chastain is said to play a caring mother in the film who transforms into a bloodshot entity wearing her skin, while trailers show her in both roles. That makes the smile a key visual element in the project’s promotion.
The available source calls Other Mommy a Universal Pictures horror project, but does not confirm whether that is the final official title or when the film will be released. The exact words Chastain used on the show are also not transcribed in the material provided. What is clear is that the segment centers on the mix of performance, makeup or physical expression, and the dual role described in the video.
The YouTube description adds that the entity has a dead-eyed expression and a wide, almost painfully unsettling smile. That detail matches IGN’s description of a smile born from tension and discomfort. Based on the information provided, this remains a promotional description of the segment rather than a full, officially confirmed synopsis of the film.
Timeline
October 8, 2026: IGN publishes an article about Jessica Chastain explaining the Other Mommy smile and links it to physical, painful tension.
October 8, 2026: Jimmy Kimmel Live uploads the video in which Chastain teaches Jimmy Kimmel the creepy smile.
October 8, 2026: The video description frames the film as a transformation from mother to entity and says Chastain plays both roles.
October 8, 2026: The video description says the entity has a dead-eyed expression and a wide, almost painful smile.
October 8, 2026: The available source names Universal Pictures as involved, but gives no release date or official title confirmation.
Background
The IGN description places Other Mommy in a horror context with a comparison to Coraline. In the same context, the film is grouped with Chastain’s earlier horror work, including IT Chapter 2, Mama, and Crimson Peak. That comparison shows how the publication positions the project within Chastain’s genre history, but it remains an editorial framing from the source.
The provided information also makes clear that the core of the segment is the visual execution of the smile. The video description talks about a mother turning into a bloodshot entity wearing her skin, while the trailers show her in both roles. That makes the transformation itself the main marketing hook in the available source, more than a detailed plot summary.
At the same time, several details remain unclear. The source does not confirm whether Other Mommy is the final title of an upcoming theatrical release, and no release date is mentioned. The exact context of the Jimmy Kimmel Live appearance is also limited in the provided material to the video and its description. So the only safe conclusion is that Chastain used the segment to demonstrate the creepy smile, not how the full conversation played out.
The Coraline comparison should therefore be read carefully. In the source, it serves as a way to sketch the project’s tone, not as independent confirmation of the film’s story or style. Based on the available details, the safest takeaway is that Other Mommy is being presented as a horror project built around a mother-to-entity transformation and a striking, painful smile as its visual signature.