Marion Cotillard and Guillaume Canet have split.

The 49-year-old actress and the 52-year-old film director have announced that they are separating with "common accord" and "mutual goodwill" after 18 years together.

They announced the split in a statement to the Agence France-Presse news agency, saying they were making the announcement in order "to avoid all speculation, rumours and risky interpretations".

They did not reveal a reason for the split.

The pair starred opposite each other in 2003's 'Love Me If You Dare' and they began dating in 2007.

In 2011 they welcomed their first child, a son named Marcel and in 2017, they had a baby girl.

While pregnant with her daughter, Marion was forced to deny speculation of a romance with her 'Allied' co-star Brad Pitt, amid his split from Angelina Jolie.

Marion wrote on Instagram at the time: "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. I am not used to commenting on things like this nor taking them seriously but as this situation is spiralling 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. He is my love, my best friend, the only one that I need.

"I do very much wish that Angelina and Brad, both whom I deeply respect, will find peace in this very tumultuous moment."

Canet also called out "the haters" who spread the "stupid and unfounded accusations".