Bella's bio on the site reads: "I'm your bitch."
The Her & Him helmer filmed a racy video to announce she has joined OnlyFans, in which she posed in a bikini and donned a diamond choker necklace featuring the word "sex".
In a statement, she said: "My favorite feed is on OF. OnlyFans is a safe place for me to be Bella. To be who I am without judgement. Without censorship.
"It's FINALLY my decision to decide how I interact with my fans. (sic)"
The 22-year-old star shared the PAPER article on Instagram and explained further why she has signed up and what her intentions are.
She's also revealed she is working on her upcoming movie with The Florida Project director Sean Baker.
She captioned the screenshot: "Thank u @paper I'm excited to talk about the politics behind female body shaming & sex!!! With the amazing director sean baker who I'm proud to call my friend. (sic)"
And she told the publication that she's a "huge fan" of the filmmaker's work and that they both have "the same vision of the movie being a conversation starter for many important topics."
Last year, Bella received the website's Vision Award from Pornhub in recognition of her work on her X-rated directorial debut Her & Him.