Penn and Korotyayeva have been romantically linked since June, when they were photographed together in Rome
The Oscar winner, 63, and Korotyayeva, 43, spent some time at Soho House in Malibu, California, on Saturday night with Gerber, 61, who is married to Cindy Crawford.
The Milk star wore jeans, a white button-down shirt, a navy blazer and white sneakers for the outing, while his girlfriend wore a black minidress and matching purse, which she paired with pink-and-black heels.
The couple was photographed chatting with Gerber outside of the establishment late Saturday night.
Penn and Korotyayeva were first linked romantically in June after they were photographed taking a stroll in Rome. During the outing in the Italian capital city, the couple was spotted embracing and kissing as they walked and shopped together.
Not long after, the Mystic River star was seen again with his new flame in Europe.
In July, the actor was photographed kissing her in Saint-Tropez, France, outside of Senequier, where they enjoyed breakfast. The actor had his arm around Korotyayeva while the two strolled through the coastal town.
Later that month, the couple continued their PDA spree stateside. They were photographed holding hands in Times Square in New York City.
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Over a year before he began dating Korotyayeva, Penn finalized his divorce with ex-wife Leila George in April 2022.
In February, amid his divorce, Penn’s ex-wife Robin Wright called her friendship with him "a gift" while addressing their public appearances in January, which marked the first time the pair (who were married from 1996 to 2010) were seen together in years.
"To be friends with the father of your children… I mean, it's a gift, because we know divorce with children is one of the most difficult things in life," The Princess Bride star, who shares kids Dylan, 32, and Hopper, 30, with Penn, told E! News.
Wright went on to say that she and Penn, who were spotted together because they were “going to an event for our children,” are "always going to be a unit that way."
"We're always gonna be family, whether we're together or apart, you know?" she added. "And I think that's beautiful, and I wish that for everybody."
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