They have been at the brunt of swirling romance rumours ever since they filmed Mary Magdalene together last year.
But Joaquin Phoenix and Rooney Mara only added fuel to the fire on Sunday, as they put on a very cosy display during the Closing Ceremony of the 70th Annual Cannes Film Festival.
The dress, custom made by Christian Dior, is so pretty with its collar, nipped in waist, full skirt and sheer fabric.
During a post-ceremony press conference, Phoenix referred to Mara as his girlfriend when speaking about whether he thought he would win Best Actor, The Cut reports.
"Before I came here, I told my girlfriend it was going to be a really good experience because I was going to get crushed and that would be really humbling," he said.
Related: Casey Addresses Those Sexual Harassment Allegations According to legal documents, the actor agreed to joint physical and legal custody of their sons — 13-year-old Indiana and 9-year-old Atticus – but wished to "terminate the court's ability to award support to petitioner" which she requested.
However, Ben Affleck's brother WILL pay up despite the contradicting paperwork. The actress recreated a shot-for-shot scene paying homage to her own mommie dearest Janet Leigh, who was famously butchered in the shower in Alfred Hitchcock's horror masterpiece! The Red Devil seemingly caught Dean Munsch in a vulnerable position, but drew back the curtain to [SPOILERS] find the Dean was gone!