Katherine Mallen Kupferer

Katherine Mallen Kupferer (born November 23, 2007) is an American actress.

Early life and career Katherine Mallen Kupferer was born in Chicago, Illinois, to Keith Kupferer, an American actor, and Tara Mallen, an American actress.

She began acting at the age of five, during a Chicago Shakespeare Theater's production of Gypsy. In 2018, Kupferer starred in Widows, directed by Steve McQueen.

In 2023, she starred in Are You There God? It's Me, Margaret., and she was cast in Ghostlight, alongside her parents.

In April 2025, it was revealed that she re-teamed with Alex Thompson and Kelly O'Sullivan on the coming-of-age drama film Mouse, which premiered at the 76th Berlin International Film Festival in February 2026.

Filmography Film

Year Title Role Notes 2016 Fools Vera's daughter 2018 Widows Gun Daughter 2023 Are You There God? It's Me, Margaret. Gretchen Potter 2024 Ghostlight Daisy Mueller 2025 They Rescue Horses, Don't They? Aubrey Short film 2026 Mouse Minnie Dunn

Theater

Year Title Role 2014 Gypsy Balloon Girl 2019 The Killing Game 2026 Do Something Pretty Phoebe