Sean Penn, 56, cosies up to new 'girlfriend' Leila George, 24, as she wears a red wig for first red carpet appearance

She's younger than his own daughter - actress Dylan Penn, 25.

But far from being embarrassed about the age gap between him and his latest squeeze, Sean Penn, 56, looked positively triumphant as he posed with 24-year-old Leila George on Thursday.

The pair made their first red carpet appearance as a couple - just hours after DailyMail.com exclusively revealed that they were an item.

What will her dad say? Sean Penn, 56, and new girlfriend Leila George, 24, make first red carpet appearance as a couple alongside Elvis Mitchell at the Los Angeles County Museum of Art on Thursday

What will her dad say? Sean Penn, 56, and new girlfriend Leila George, 24, make first red carpet appearance as a couple alongside Elvis Mitchell at the Los Angeles County Museum of Art on Thursday

Fresh from a romantic vacation in Hawaii - where Penn has long owned a beachfront home in Oahu - the pair had equally sun-kissed skin as they smiled beside one another.

The young actress was dressed to impress in a black dress featuring sheer panels at the waist and arms, while Penn was clad in a rather more relaxed denim buttondown.

Leila wore a red wig over her blonde hair for the event at the Los Angeles County Museum of Art. 

Working: She had been reading, while Sean then got involved in a panel discussion

Working: She had been reading, while Sean then got involved in a panel discussion

She had been reading, while Sean then got involved in a panel discussion.

It is not the first time the two have worked together - with Leila previously posting a picture of them both in a studio, where they were recording the words for an audio book. 

'In the studio today recording Pappy Pariah's mem-noir "Bob Honey: Who Just Do Stuff" for Audible,' she tweeted, alongside a picture of her and Penn.

Australian-born, Leila has an A-list pedigree, born to Emmy nominees Greta Scacchi - who at 56 is the same age as her new man - and Vincent D'Onofrio, 57.

Dating? The pair were seen earlier on Thursday in the Little Ethiopia area of LA

Dating? The pair were seen earlier on Thursday in the Little Ethiopia area of LA

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Scacchi is best known for her performances in Broken Trail, Rasputin, and the Australian classic Looking For Alibrandi, while fans will recognise D'Onofrio from Law & Order: Criminal Intent, Daredevil, and Jurassic World.

Unlike her established parents, Leila's acting career is only just beginning, with the ingénue recently making her screen debut in the Lifetime TV movie Mother, May I Sleep with Danger? alongside James Franco and Tori Spelling.

Prior to that, the thespian honed her craft on the stage and in prestigious acting schools across the globe.

Come here: Sean grabbed Leila for a kiss as they enjoyed the surf near his Oahu beachfront home in Hawaii 

Come here: Sean grabbed Leila for a kiss as they enjoyed the surf near his Oahu beachfront home in Hawaii 

At 19, she completed a course at The Australian Film School in Sydney, before spending two years studying in the Lee Strasberg Institute in New York.

Little else is known about Leila, with the blonde beauty keeping a relatively low-profile until her tryst with Penn went public this week.

In steamy pictures of the pair, the Milk actor could be seen passionately cupping Leila's neck and face as he kisses the bikini-clad actress in the surf.

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