"Anytime I'm on one of his sets it feels like it is going to be something special," says Bell.
The film is accumulating a star-studded cast with Brad Pitt, Leonardo DiCaprio, Margot Robbie and Al Pacino already confirmed in the main cast, with other big names expected to join.
Having shared the set with DiCaprio and Pitt on multiple occasions, Bell described the duo as complete professionals, and admitted she couldn't wait to work with Margot Robbie.
While working on the set of Once Upon a Time in Hollywood, Bell has also been involved in creating a new campaign for The Wilderness Society of Australia.
The campaign, #saveugly, is bringing attention to endangered species of animals which have been overshadowed because of the way they look.
Bell also explains that all animals — not just the good looking ones — play a part in our world.
"We also want to raise awareness to the fact that there are so many parts of our ecosystem and it's all interdependent on each other," says Bell.
While the focus for the campaign is on the animals, Bell thinks that the overall message can also be used for how we treat other people.
"What we may see as ugly is actually beautiful which, is essentially a much larger message rather than just the environment, sort of how to treat fellow humans as well, but that might just be me reading into it," she says.
The #saveugly campaign was released on June 20 with the music video which was worked on by Bell.
Once Upon A Time in Hollywood is expected to be released on August 9, 2019.
