In 2009, Jessica was named as ambassador of the Diamond Guild of Australia, an organization which aims to uphold ethical standards in Australia's diamond industry.
Before she decided on becoming an actress, Jessica wanted to be a historian or psychologist.
Jessica has a real tattoo which was shown in the film Two Fists One Heart as her character Kate has one too.
Jessica has been single since her break-up with long-time boyfriend, artist Ben Riding in 2009.
In the 2009 Logie Awards, Marais won both the Graham Kennedy Award for Most Outstanding New Talent and a Logie for Most Popular New Female Talent. Both awards were for her series, Packed to the Rafters.
When Jessica was 15, she composed a song that won her band top honors in the Battle of the Bands at University of Western Australia. She also played the guitar and sang vocals.
Her diplomat father, Tony, died when Jessica was only ten years old. Her mother, Karen, is a teacher. She has a younger sister Clara.
After graduating from acting school, Marais has been doing TV commercials and corporate videos to earn some money while starting out in the acting business.
When she has the spare time, Jessica loves listening to music, drawing, doing Yoga, shopping, and dancing.
When she was growing up, Jessica enjoyed watching classic MGM films and cartoons like Animal Farm. She believes it has educated and influenced her as an artist.
Jessica: You have to live in the world as well. As an actor you are trying to emulate things that are happening to other people. I think you can become isolated and lose touch with that and your work isn't being infused with the richness that you could be absorbing.
Jessica: I come from a family that was really nurturing of the arts. My parents both adored music, film and theatre. So I was brought up with it all around me. That infused my hunger for it.
Jessica: Every time I watched a film or saw a great piece of theatre, I yearned to be involved in it.
Jessica: As an actor you are looking for a role that allows you to suck the marrow out of life and put it on the screen and Rafters has given me a perfect opportunity to do just that.
Jessica: Work is work, regardless of whether it's film, television or theatre. It's the stories, what I'm doing with the work that is most important.
Jessica: I was brought up in a family that was really nurturing of the arts. My dad used to adore music and film. So I was brought up with a lot of theatre, stories, film and television around me and an appreciation for it. That infused me with a hunger for it.
Jessica: I loved being read aloud to when I was little and I thought that nothing told a story like a good play or a good film.
Jessica: (on the effects of acting in her personal life) This industry takes a toll on your personal life, and I'm still learning a lot about how I have to balance that. It's overwhelming! The whole process has been incredibly rewarding.
Jessica: (National Institute of Dramatic Art or NIDA was where she studied acting.) I didn't want to come out of NIDA and become a waitress, I want to act. I am so hungry to work I think it would be crazy to turn anything down in my first year of out NIDA.
Jessica: (on being dubbed the next Cate Blanchett) I want to be the next Jessica Marais not Cate Blanchett. It detracts from what is unique about you, which is how you get the role.
Jessica: I think it's amazing what people can do with film to evoke a response in an audience. I think there's nothing quite like a beautiful soundtrack and beautiful cinematography and amazing editing to get a response from an audience, and that just excites me so much about film. That, as well as the collaborative effort that goes into making a film - I have such a huge respect for the amount of work that goes on.
Jessica: I think acting is an apprenticeship craft essentially, especially for film for me because I come from a school where we have had film training, but it is primarily a theatre background, so you absolutely treat it as a huge apprenticeship, and a really awesome experience and an awesome opportunity to watch someone do what they do well, and what they've done for years, refining their craft, while the rest of us are starting out - it's really cool.
Jessica: (on having plans of moving to Los Angeles; in a 2009 interview) There are no plans to move there just yet – it's more to have people on the ground over there looking at scripts and seeking out opportunities for me.