Trivia

She is trained in mixed martial arts.

She speaks Russian and Spanish.

She is a vintage car enthusiast.

Founded the production company Fifty-Fifty Films.

Is considered a modern day scream queen due to her numerous roles in horror films. Sweeney herself is a fan of horror, her favorite horror films that inspired her to act in the genre being El bebé de Rosemary (1968), Halloween (1978), El resplandor (1980), Pesadilla en la calle del infierno (1984), El silencio de los inocentes (1991), El legado del diablo (2018), and Nosotros (2019).

She has a younger brother, Trent Sweeney, who also worked as an actor.

Despite her status as an iconic blonde bombshell, Sweeney is actually a natural brunette. She had to dye her hair blonde for the role of Cassie Howard in Euphoria (2019), and despite it being associated with her ever since, the constant re-application of hair dye led to her natural hair getting damaged.

Miu Miu ambassador.

She ended her engagement to producer Jonathan Davino in 2025. He co-produced her film Inmaculada (2024).

She played the title role in Christy (2025). Despite good reviews, the film flopped at the box office. Ruby Rose, who was passed over for a role in the film, blamed Sweeney for the film's failure.