Joaquin Phoenix and Sister Rain Phoenix Smile Together in Rare Appearance at Venice Film Festival

The siblings last appeared together on a red carpet during the 2020 Oscars

Joaquin Phoenix had a special guest at the premiere of Joker: Folie à Deux: his sister Rain Phoenix.

The siblings stepped out to walk the red carpet together during the Venice Film Festival on Wednesday, Sept. 4, marking a rare joint appearance.

While Joaquin, 49, wore a classic black tuxedo and tinted black-rimmed sunglasses, Rain rocked a long-sleeved dark-brown column gown with a crisscross pattern and black shades.

The last time Joaquin and Rain, 51, publicly appeared together at an event was at the Vanity Fair Oscar Party in Beverly Hills, California, on Feb. 9, 2020.

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Related: All About Joaquin Phoenix’s 4 Siblings: River, Rain, Liberty and Summer

Rain and Joaquin are the younger siblings of the late actor River Phoenix, and they also have two younger sisters: Liberty Phoenix and Summer Phoenix.

Many of the siblings have gone the show-business route, with Joaquin as an Oscar-winning actor and Rain as an actress and singer.

Twenty-six years after River died in 1993 at the age of 23, Rain, who previously performed with River in their alternative rock band Aleka’s Attic, released her first solo album, River, on the anniversary of his death.

Asked by PEOPLE what River was like as a sibling, Rain said in 2019, "Very protective. And creative. I think he probably taught all of us a few chords on guitar and hoped that we would follow his lead and maybe be able to play lead, so he didn’t have to. He was such a great older brother."

"When I think about it, River introduced me to every experience that helped to form the direction I took in my life," added Joaquin. "He was always encouraging me and sharing everything he had."

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Related: Joker: Folie à Deux First Reviews Praise 'Real Spark' Between Joaquin Phoenix and Lady Gaga

Joker: Folie à Deux took its first bow in Venice on Wednesday, after a press conference earlier that day at which Joaquin was joined by costar Lady Gaga and director Todd Phillips, who also directed the first Joker film in 2019.

"I would say on this one I’m more nervous," Phillips, 53, told reporters at the press conference. "There are a lot more expectations on a second film. There’s more nervousness."

According to a synopsis, Joker: Folie à Deux "finds Arthur Fleck institutionalized at Arkham awaiting trial for his crimes as Joker. While struggling with his dual identity, Arthur not only stumbles upon true love, but also finds the music that's always been inside him."

Joker: Folie à Deux is in theaters Oct. 4.

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