'It completely changed the person I am': Jessica Chastain talks about her sister's tragic suicide as she graces magazine cover
Her sister Juliet took her own life after a long battle with depression in 2003.
And Jessica Chastain has spoken about the tough subject in the accompanying interview for her upcoming Instyle cover.
In the January issue of the publication, the 37-year-old actress revealed that she was devastated by her younger sister's death over a decade ago but believes the experience has helped her stay grounded.
Scroll down for video
Pretty in purple: Jessica Chastain is on the cover of the January issue of InStyle magazine
The Help star sai d: 'It completely changed the person I am. A movie, Oscars, a dress, if someone thinks I'm stupid...I realised nothing is that important.'
She also discussed another life-altering moment when she described being cast on The Tree Of Life opposite Brad Pitt, as she recalled first being told 'no one would ever cast an unknown opposite Brad Pitt'.
Jessica told the publication: 'I knew the second Brad signed on it was a game changer for my career. Then I was just scared I was going to get fired. It wasn't until after a week of shooting that I started to relax.'
The motivation has seemingly worked as she has tallied up two Oscar nominations and a Golden Globe win since starring with the husband of Angelina Jolie in the drama.
'it was a game changer for my career': The 37-year-old actress credits working with Brad Pitt on 2011's The Tree Of Life with helping her alter her career
On the front of the new issue of the monthly, Jessica stuns in a clinging sleeveless purple frock featuring a cut out at the torso.
She accessorised the look with gold jewellery including bracelets and a necklace featuring a chunky gold pendant.
The Zero Dark Thirty star's fiery red locks were worn down over one shoulder as she had natural, complimentary make-up on her face.
She may be currently romantically linked to Italian fashion executive for Montcler, Gian Luca Passi de Preposulo, but she has her own personal policy on not dating actors.
Sticking to her guns: Jessica also revealed that she made the choice to not date actors early in her career, as she was pictured at a screening of A Most Violent Year in New York last month
She told InStyle: 'I made sure when I started that I was known for my work, not for whom I was dating.
'Acting is all about being open to another person, and to date an actor, it just confuses it, because how do you even know if it’s real?'
Jessica is currently busy promoting her upcoming film, A Most Violent Year, which is a crime drama that is set in New York during winter 1981, statistically one of the most violent years in the city's history.
In the film, Jessica plays Anna, wife of Abel (played by Oscar Isaac), a principled businessman whose growing profits threaten the New York underworld.
Her character has connections on the other side of the law, and steps up to defend the family business when her husband will not. A Most Violent Year is set to hit theaters December 31.
Upcoming: The actress can soon be seen alongside Oscar Isaac in the film A Most Violent Year, which is set for release on December 31
- Kelly Osbourne backpedals after off-colored comment on Trump
- 'UFO' captured on film overtaking a flight from JFK Airport
- President Obama calls Donald Trump of The Tonight Show
- Nailed it! Horse overcomes fear of ditch in spectacular leap
- Hiker films petrifying encounter with Montana mountain lion
- Al-Saadi Gadhafi is beaten on the soles of his feet by...
- Shocking moment dad tries to RUN OVER daughter's bullies
- Kansas town mourns bat boy with 'infectious spirit'
- Alleged road rage attackers run over man with his own car
- CCTV shows lead up to point-blank fatal shooting in Ukraine
- Beijing 2022 accused of ripping off Frozen with this track
- Incredible moment cop pulls man off tracks as train arrives
- 'Then who is going to clean your toilets?' Kelly Osbourne...
- Heartbreaking scene as dying bat boy, nine, was cradled by...
- EXCLUSIVE - 'I felt sick. It was like looking at myself in...
- EXCLUSIVE: Inside Jill Duggar's life as a missionary in EL...
- Bankrupt 50 Cent's mansion costs him $70k a MONTH to...
- EXCLUSIVE: Yours for only $60 million – pictures of the...
- Revealed: How distraught girlfriend heard the final cries of...
- Plane 'window' washes up on Reunion Island in hunt for...
- Brown and Houston families at WAR as photo of Bobbi Kristina...
- Canadian TV star found dead in an alley beside the home he...
- EXCLUSIVE: Cecil the lion killer's $1million Florida...
- Texas father jailed for life after fathering his underage...