Actors' Aussie daughter, 24, is dating Sean Penn

He might be 56, but you're only as old as the woman you make out with in the ocean, hey Sean Penn?

The actor has been spotted getting hot and heavy in the Hawaiian waves with Australian actress Leila George, who happens to be the daughter of Law & Order: Criminal Intent star Vincent D'Onofrio and Perth-raised actress Greta Scacchi, who just happens to be 56 also.

Clad in their swimmers, the pair were getting their pash on - and then some! - and sources confirm to E! News that the Sydney native and the Hollywood heavyweight are a legit couple.

Shortly before their holiday make-out sesh, Leila Instagrammed a snap of herself standing behind her new man in a Malibu studio, captioning it, "In the studio today recording the audiobook of Pappy Pariah's men-noir Bob Honey: Who Just Do Stuff for @audible_com."

And at just 24 years of age, she's just a year younger than his daughter Dylan, 25, who he had with ex-wife Robin Wright, along with son Hopper, 23.

She also bears more than a passing resemblance to Robin, who was 33 when she first hooked up with Sean following his divorce from Madonna.

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The smooth mover was also set to wed Charlize Theron before they called off their engagement in 2015.

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