Sean Penn, 59, is joined by 27-year-old girlfriend of 3 years at charity gala: See the photo

There's a 30-plus year age gap between them, but Sean Penn and his girlfriend are still going strong.

Penn, 59, and his girlfriend of more than three years, 27-year-old Leila George, made a rare public appearance together this week at the CORE Gala in Los Angeles. Penn founded the organization in 2010 in response to the massive Haiti earthquake.

Also present at the event were Penn's two children, son Hopper, 26, and 28-year-old daughter Dylan.

Penn is still sporting a mustache these days, and George dressed for the occasion in a red double-breasted suit.

Above: Sean Penn and Leila George at the CORE gala. Credit: Getty

Rumors of a romance between Penn and George first emerged in October 2016, when the then-24-year-old posted a snapshot of the twosome recording an audiobook together in a studio. They rarely, however, hit red carpet events by each other's side.

The Australian-born actress has appeared in a handful of TV shows and films and has a recurring role on the TNT show "Animal Kingdom." Her dad is Emmy-nominated actor Vincent D'Onofrio, who starred on "Law & Order: Criminal Intent" for more than a decade.

It's unclear whether George is close with Penn's kids, whose mom is "House of Cards" actress Robin Wright. The siblings posed for a photo together at the event, and the resemblance to their parents is pretty uncanny.

Above: Dylan and Hopper Penn together at the CORE gala. Credit: Getty

The CORE Gala raised $5 million for natural disaster relief, thanks in part to support from famous faces including Julia Roberts, Leonardo DiCaprio, Jim Carrey and more high-profile attendees.