The actress, 46, sported a stunning halter neck gown emblazoned with silver metal tassels from the brand Gucci, who presented the event.
Posing up a storm at the star-studded bash, the beauty displayed her gorgeous figure in the sleeveless number.
She carried a small silver handbag for her essentials and accessorised the look with statement earrings.
Jessica was joined by actor Peter Sarsgaard, 52, who she stars alongside in her new film Memory, which was released in September.
Glitz: Jessica Chastain oozed vintage glamour in a metallic Gucci gown with fringe embellishing on Saturday night at the 2023 LACMA Art + Film Gala in Los Angeles
Glam: Her couture gown hugged her curves and featured a halter neck design, with intricate beaded patterns emblazoned all over
Jessica’s character, Sylvia, is a single mum working as a social and care worker. She is a recovering alcoholic and has a teenage daughter, Anna, played by Brooke Timber.
It follows the story of Sylvia, a social worker who leads a simple and structured life until Saul (played by Peter) follows her home from their high school reunion.
Their surprise encounter profoundly impacts both of them as they open the door to memories, challenges and revelations between one another.
The film has received rave reviews and both actors extraordinary performances have meant they have entered the Oscars race, according to Variety.
Sarsgaard’s performance will be submitted for supporting actor consideration at the major ceremonies, including the Golden Globes, SAG and Academy Awards, whilst Jessica will compete for lead actress.
The twelfth annual LACMA gala, presented by Gucci, was held at the Los Angeles County Museum of Art located on LA’s famed Wilshire Blvd.
Beautiful: The film star tied her fiery red locks back into a soft up do and opted for a glowing palette of makeup as she posed up a storm for the photographers
All smiles: She was joined by actor Peter Sarsgaard, 52, who she stars in the film, Memory alongside – both performances of which means they’re in the running for an Oscar
Big business: The film tells the story of Sylvia (Jessica), who leads a simple and structured life until Saul (played by Sarsgaard) follows her home from their high school reunion
The Art+Film Gala is an annual event that brings out some of the biggest names in art, film, fashion, and entertainment.
Saturday saw LACMA trustee Eva Chow and actor Leonardo DiCaprio co-chair the event for the twelfth consecutive year.
This year’s event honoured artist Judy Baca, the director of the project that created the Great Wall of Los Angeles which is the largest communal mural project in the world.
Proceeds from the annual Art+Film Gala go toward underwriting LACMA’s initiative to make film more central to the museum’s curatorial programming, while also funding LACMA’s broader mission.