Ten-year-old Arabella Olivia Clark isn’t just starring in a horror film — she’s already rewriting the rules for child actors. Her breakout role as Bela in Other Mommy, a Rob Savage-directed thriller about a girl stalked by a doppelgänger of her mother, has landed the movie at No. 1 on its opening day with $12.6 million in domestic earnings. It’s her first leading feature, and she’s not backing down from the challenge. On a Zoom call from her Los Angeles hotel room the morning after the premiere, she wore a jacket emblazoned with her character’s name, Bela. And spoke with the calm confidence of someone who’s already seen more than most adults. 'I love spiders. I love snakes. I like all the creepy stuff,' she said when asked what scares her. 'I love the dark, so I don’t really know what I would be afraid of.' Her mom, Rachel Clark, chimed in off-camera: 'She’s always willing to try everything. Even if she can’t do something, she’s like, “Yeah, I’ll try that.”' That fearless attitude extends beyond the screen. She takes swimming and sailing lessons, skills that came in handy during the film’s intense underwater sequences, shot in a tank 20 feet deep. 'It was massive,' Rachel recalled. 'Watching her film in the water was one of the scariest moments as a mom.' But Arabella didn’t flinch. She’s been reading since she was young, and before even auditioning for Other Mommy, she devoured Josh Malerman’s 2024 novel Incidents Around the House in three days. 'I got chills!' she shared. The story still unsettled her, but not enough to stop her. She’s now a self-proclaimed horror aficionado, drawn to stories where the impossible feels real. Her favorite book? Bunnicula, a vampire rabbit series. Currently, she’s reading Jeff Kinney’s Awesome Friendly Spooky Stories, which she held up proudly during the interview. Working with Jessica Chastain wasn’t just professional. It became personal. The two spent time together outside filming: hiking, going to parks, even hanging out in Chastain’s trailer. 'She’s a great mom,' Arabella said. 'And she’s also studying for Harvard. I can’t believe it.' One moment stuck with her: Chastain’s witch cackle, delivered loud and sudden. 'That part scared me!' Arabella admitted. But she quickly added: 'Once the camera’s rolling, it’s one thing. When it’s not? We were telling jokes, showing pictures, taking selfies.' She’s not limiting herself to horror. She wants to explore sci-fi, specifically a potential sequel to E.T.. And dreams of working with Steven Spielberg. 'Maybe Rocky and E.T. Could be friends, because they’re both aliens, right?' she mused. She loves The Meg, Project Hail Mary, and anything involving space, sharks, or octopuses. 'I want to go to space,' she said. 'And I love reading spooky stories in the dark with a flashlight at night.' Her past roles include a younger version of Amanda Seyfried in Paul Feig’s The Housemaid, a film that also left her unnerved. But she doesn’t mind. 'I really do love doing scary stuff,' she said. 'I’m always gonna look up to her.' Now, she’s not just playing a scared kid, she’s becoming the kind of actor who makes others afraid. And she’s only ten.