While watching last night's penultimate episode, Bella - who was runner up on Locky Gilbert's season last year - said it is "obvious" Brooke wins.
"Based on the edit, we now know that Brooke is the one Jimmy ends up with," she told her 110,000 Instagram followers.
"Key points for that is the music that's used is all magical and twinkly and lovey dovey."
"She's the only one that Jimmy actually spoke about his feelings in response to how she feels. With the other girls he just sat there, or [the producers] cut out if he said anything to them in the edit."
The 26-year-old also pointed out that Brooke has received the most screen time over the past few episodes.
Bella said it would be cute if Brooke were to win, given her and Jimmy's "strong connection from the beginning".
Despite putting money on the 27-year-old occupational therapist stealing Jimmy's heart, Bella said the pilot would have been well suited to Holly.
"From what we can see in this episode, they're not showing any signs of conflict and it's a really positive, natural connection," she said.
"I hope he chooses Holly but God knows on this bloody television show."
Bella has changed her tune after earlier predicting Holly would be the final woman standing.
"My girl got the magic music," she said during last month's premiere, hinting the marketing manager wins.
There have been many theories as to how The Bachelor tries to hint at the winner over the years.
From the "first girl to exit the limo", to the "magical music" as she and Bachie share their first conversation, all the way to who is wearing the lighter dress at the finale, Bachelor fans have become experts at formulating theories as to how Channel Ten hints at the show’s winner year in and year out.
Currently, both Sportsbet and TAB predict an identical winner for Jimmy Nicholson.
The predicted winner, Holly, has been listed as a 1.30 on Sportsbet, and a 1.10 on TAB, while Brooke's odds stand at 3.25 and 6.00.
Following Jay's departure from the show on Wednesday night, the nutritionist took to Instagram to share her disappointment.
"The Queens Gambit has always been my opening, and it’s always been a good one (except that one time on national TV). My middle game, that's the adventure. But my end game, well that has always been my downfall," Jay wrote on Instagram.
"Unfortunately, I never captured the King... but what I can say is that I have met some amazing Queeeeens! Some of the most intelligent, beautiful, and empowering women I’ve ever had the pleasure of knowing."
Jay was a clear frontrunner after receiving the key to the business lounge on the first episode, but Jimmy started having doubts over the 31-year-old after rumours she was only on the show for fame kept popping up.