The 57-year-old actor made the admission in a discussion about how she has adopted kittens from her garden, and while reflecting on starring as Batman's sidekick in the 2004 superhero film, which was mauled by critics.
"I became a cat lover because of it," Berry told Entertainment Weekly about the upside of featuring in the flop.
"I just rescued four kitties I found in my yard three weeks ago. I'm a Catwoman through and through, because of that experience and those relationships. That experience changed me."
Entertainment Weekly described Berry as a "self-proclaimed, lifelong dog person".
Berry, who also owns two Labradoodles, recently posted on her Instagram that she adopted kittens from a family of stray cats she discovered in her garden.
View this post on Instagram A post shared by Halle Berry (@halleberry)
She posed with two of the felines, who she called Boots and Coco.
"I found these two little fur babies in my yard along with their 2 siblings and their mom!" Berry wrote.
"I got the mommy spayed and released her back in my yard and she's now our outdoor cat and the other 2 babies I've found a forever home for and these two are our new lovies. It's a full house over here!"
Berry also told Entertainment Weekly her preparation for Catwoman involved being given a cat early on during the production because she didn't have one.
"His name was Playdough. I watched, studied and learned how cats think," she said.
"I didn't have the responsibility of children and family; I was just a woman alone with a lot of idle time to focus on this.
"I'd crawl around my house, trying to jump on my counters, thinking, 'If I were a cat, how would I get up there?' I was in it 24/7."
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