Phoenix gave an emotional shout-out to Mara during his Golden Globes acceptance speech in January, and fans saw a quick glimpse of them at the Oscars when Phoenix won Best Actor for his role in Joker.
Here's a little more about the couple's relationship, from when the two first started dating to the reports that they're expecting.
Joaquin Phoenix and Rooney Mara met on the set of Her.
The 2013 film starred Phoenix as writer Theodore Twombly, a man who falls in love with his artificial intelligence virtual assistant played by Scarlett Johansson, while Mara played his ex-wife Catherine.
However, the duo didn't start dating until they started filming the biblical movie Mary Magdalene in 2016. Phoenix later told Vanity Fair that he thought Mara didn't like him while they were shooting Her, but it actually turned out that she was just shy. "Shes the only girl I ever looked up on the internet," Phoenix revealed. "We were just friends, email friends. Id never done that. Never looked up a girl online."
Their first public appearance as a couple was at the Cannes Film Festival in 2017.
Phoenix and Mara attended the closing ceremony of the festival together in May 2017, and she congratulated him when he won the award for Best Actor for his role in the thriller, You Were Never Really There.
During a press conference after the ceremony, Phoenix referred to Mara as his girlfriend: "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, I thought it would be great to know what its like to be unanimously disliked. That was my expectation coming here, so this is better."
During an interview in September of that same year, Phoenix revealed that he and Mara were living together, and he also mentioned that while he rarely sees new movies, he had recently watched The Staircase, a 10-hour true crime documentary, because Mara wanted to.
Joaquin Phoenix and Rooney Mara got engaged sometime in 2019.
The couple first sparked engagement rumors when Mara was seeing wearing a diamond ring in May 2019, and the news was confirmed by Us Weekly in July.
Phoenix and Mara were also seen on a number of red carpets together in 2019, as Phoenix was promoting Joker .
On September 9, Phoenix was honored with the Tribute Actor Award at the Toronto International Film Festival, and he gave Mara a shoutout in his speech with a nickname that refers to her role in The Girl With the Dragon Tattoo: "One last thingsomewhere here, I dont know where, is a filthy dragon, and I want to rip its wings off and fasten a blanket and sleep with it forever. I love you. Thank you."
Joaquin Phoenix and Rooney Mara went to the 2020 Golden Globes together.
Phoenix and Mara attended the Golden Globes together on January 20, and photographers shot a number of photos of the actor admiring his fiance.
Later that night, Phoenix won his second Golden Globe for Best Actor in a Drama Motion Picture, and he told Mara that he loved her during his speech.
The couple also went to the 2020 Oscars together.
While Phoenix and Mara attended the ceremony together, they again posed separately on the red carpetalthough photogs later caught them walking hand-in-hand.
Fans also caught a sighting of the couple when Phoenix accepted his Best Actor award.
Joaquin Phoenix and Rooney Mara are reportedly expecting a child in mid- to late 2020.
On May 18, a source told Page Six that Phoenix and Mara were expecting, and it was reported that Mara be about six months along. The couple have been quarantining together in their Los Angeles home due to the coronavirus pandemic, and they've occasionally been spotted running errands . Neither Phoenix nor Mara have confirmed or denied that they're expecting, but that's totally par for the course for the private couple.