Marion Cotillard's partner Guillaume Canet calls Brad Pitt cheating rumors 'stupid' and 'unfounded'

Marion Cotillard's partner, Guillaume Canet, is breaking his silence.

The 42-year-old actor and director took to social media on Friday to speak out against rumors that Cotillard was involved in an affair with Brad Pitt.

"I don't usually make it a habit to comment on rumors made about us," Canet wrote in French on Instagram, alongside a picture of a "Danger" road sign.

"I also don't usually talk about my private life until now. I have always protected attentively ... But the fury of the tabloids, the venal stupidity of some people calling themselves journalists, the haters who feel braver behind a keyboard, drive me to speak of the pride, love, respect and admiration I have for Marion staying as strong and intelligent in the face all these stupid and unfounded accusations," he added.

"I think we're all living with much more important things at this moment and now it's time to move on and raise the bar a bit," Canet continued. "Even if there's so much work for some, I want to be positive. And as Marion said so well I hope you get better and aspire to something in your life than constantly sending sh*t!"

On Wednesday, Cotillard, who stars opposite Pitt in the upcoming film Allied, also addressed the cheating rumors.

"This is going to be my first and only reaction to the whirlwind news that broke 24 hours ago and that I was swept into," Cotillard began her lengthy post. "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."

"Firstly, many years ago, I met the man of my life, father of our son and of the baby we are expecting," she said of Canet and their 5-year-old son, Marcel. "He is my love, my best friend, the only one that I need."

"Secondly, to those who have indicated that I am devastated, I am very well, thank you. This crafted conversation isn't distressing. And to all the media and the haters who are quick to pass judgement, I sincerely wish you a swift recovery," she continued.

"Finally, I do very much wish that Angelina and Brad, both who I deeply respect, will find peace in this very tumultuous moment," she concluded the essay, signing the post: "With all my love, Marion."

The New York Post reported on Tuesday, shortly after news of Pitt and Angelina Jolie's divorce broke, that Jolie had filed for divorce after she hired a private eye and learned that Pitt was having an affair with Cotillard.

Sources told ET, however, that these reports were simply "not true."