The pair reportedly welcomed their baby in September. They named him after Joaquin’s brother who died of an accidental overdose in 1993.
Documentary film director Victor Kossakovsky revealed the news about the couple’s baby.
He spoke about it at the Zurich Film Festival on September 27. This followed a screening of the documentary Gunda which Phoenix executive produced.
During a Q&A with journalists, Kossakovsky said: “He just got a baby by the way… beautiful son called River.”
Joaquin Phoenix and Rooney Mara op-ed
As a notoriously private couple, the pair hadn’t yet openly discussed their baby. But they have now mentioned him in an op-ed for People magazine.
The couple penned a piece about children who’ve been separated from their families at the US-Mexico border.
Their article followed reports that 545 of these childrens’ parents have not been found.
‘As new parents’
They wrote: “The weight of that number is staggering. Five hundred forty-five children.
“As new parents, it’s unbearable to imagine what it would feel like to have our child taken away from us for a day, let alone years. But that’s the very situation those 545 children and their parents have been living through.”
They added: “We have to ask ourselves: Is this the country that we want? Are these our values?
“How will it feel to explain to our son, when he asks us about this time and how we treated scared, defenceless children, some of whom may never see their parents again?”
Joaquin and Rooney
No reports have been able to confirm exactly when Phoenix and Mara started dating. Any speculation is inconsistent as a result of the couple being so private.
Page Six reports that the couple – who often engage in vegan advocacy together and separately – first met in 2013, on the set of Spike Jonze film Her, and began dating in 2018 after acting together in the movie Mary Magdalene.
Some reports say they got engaged in July 2019, based on Mara being snapped wearing a ring on her third finger.
However, others say the couple will never marry because they believe ‘marriage is too mainstream’.