Pregnant Marion Cotillard showcases her bump in an understated gown as she gives maternity wear a red carpet makeover at Allied premiere

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She's remained truly dignified throughout her involvement in Brad Pitt's divorce.

And it was another understated appearance from pregnant French actress Marion Cotillard, 40, on Wednesday night, as Allied co-star Brad returned to the red carpet.

Despite having her name dragged into the messy separation of Brad and wife Angelina Jolie through false romance claims, Marion has quietly turned her attention to welcoming her first child.

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Elegant: Marion Cotillard looked effortless at the Allied premiere in Los Angeles, showcasing her baby bump on the red carpet

As such, the exquisite brunette showcased her pregnancy figure when she hit the Allied premiere in Los Angeles.

She gave maternitywear a red carpet makeover, deciding on a chic, navy blue gown that skimmed over her baby bump.

Sans detail, the sleeveless dress simply featured a neat, sweeping train and a high collar.

Understated: It was a truly elegant, classic display from the French actress

Reunited: Despite being dragged into his messy divorce, Marion supported Brad Pitt (right) as he made his return to the limelight

Back in the spotlight: Brad returned to the red carpet for the first time since his wife Angelina Jolie filed for divorce

Marion confirmed her pregnancy with partner of eight years Guillaume Canet in September.

It was a simultaneous announcement, tainted by her denial about alleged relations with 52-year-old Brad, said to have taken place as they filmed the WWII drama.

'This is going to be my first and only reaction to the whirlwind news that broke 24 hours ago and that I was swept up into,' she said, referring to Angelina's decision to divorce Brad. 

'I am not used to commenting on things like this nor taking them seriously but as this situation is spiraling and affecting people I love, I have to speak up'. 

Close: Their on-screen chemistry saw the pair accused of having an affair during filming

Taking a back step: Marion denied any allegations of an affair in a length post in September

Acting: They play a husband and wife on screen but maintained a strictly professional relationship, off screen

She went on: 'Many years ago, I met the man of my life, father of our son and of the baby we are expecting. He is my love, my best friend, the only one that I need.' 

Marion went on to wish Brad and Angelina 'peace in this very tumultuous moment,' in her lengthy Instagram response.

Angelina, who has six children with partner-of-12-years Brad, filed for the divorce the day after an alleged altercation between Brad and their eldest son Maddox.

On Wednesday, Brad was cleared attacking the child on a private jet; an incident which was at the time thought to have prompted their separation in September.

Married: In the film Allied, the pair are locked in a passionate yet suspicious relationship during WWII

Is she or isn't she? Brad's character suspects that his wife is a Nazi spy

Relaxing: During the Q&A that day, Brad seemed to relax slightly more

Talking shop: It was originally thought that the actor would cancel his promotional duties as his messy divorce gets more complicated

Actor Brad, looking drawn and visibly slimmer, returned to the red carpet that evening to thank his fans for their ongoing support. 

He told E! news: 'It's really sweet, everyone has been really kind out here. It's really nice to have all the support.'  

The red carpet was lined with baiting fans and Brad even appeared more relaxed when he sat down for a Q&A with the cast, later that night. 

Brad was previously thought to have cancelled many of his promotional duties for Allied while his custody battle with Angelina rages on.  

In his role: Brad has been heartbroken by accusations of child abuse, that he was cleared of on Wednesday

Talking shop: The actors were in conversation with director Robert Zemeckis 

Glowing: Marion confirmed her pregnancy in September

Expecting: She is expecting her first child with partner of eight years Guillaume Canet

Dignified: She has wished Angelina and Brad 'peace' during their tumultuous divorce

In the film, he plays Canadian intelligence officer Max Vatan who meets and falls in love with French Resistance fighter Marianne Beausejour (played by Marion) during the second world war.

Max is torn when he is told that she is a Nazi spy and that he must kill her, and so their relationship is rocked by suspicion. 

Promotional duties for the movie will be demanding on the pair, who also immersed themselves in photocalls earlier in the day.

Proving that the Allied appearances will be a consistent run of noteworthy sartorial displays for Marion, the pregnant star was this time hugging her bump in stripes.

She wore a drop waist dress with a band that sat just beneath her bump to emphasise her new pregnancy curves. 

On point: Marion wore stripes for her photocall appearance earlier that day

Dressing her bump: She proved that her approach to maternity dressing with be noteworthy

Stunning: At 40, the pregnant actress looked remarkably ageless

Screen beauty: She will be kept on her toes during promotional duties for the film