At it again Sean? Penn's 'secret girlfriend is heartbroken' after he is seen kissing Leila George

DailyMail.com exclusively revealed last week that Sean Penn is dating a woman 32 years his junior.

But while the news might have raised a few eyebrows, for one woman it came as an enormous shock - his girlfriend.

The woman, whose name has not been made public, believed she was in an exclusive relationship with the 56-year-old lothario - at least, until she saw him embracing Leila George, 24.

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At it again Sean? Penn's 'secret girlfriend is heartbroken' after he is seen kissing Leila George, it has been revealed

At it again Sean? Penn's 'secret girlfriend is heartbroken' after he is seen kissing Leila George, it has been revealed

Wining and dining: Now back in Los Angeles after their Hawaii trip, Sean and Leila have been seen visiting a museum for a red carpet event, and out to dinner

Wining and dining: Now back in Los Angeles after their Hawaii trip, Sean and Leila have been seen visiting a museum for a red carpet event, and out to dinner

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And while for those who have followed Penn's turbulent dating history the twist may come as no surprise, the 'secret girlfriend' is said to be 'heartbroken'.

According to Page Six, who revealed the woman's existence on Monday, she only found out about Sean's other woman after seeing the pictures of him embracing Leila on DailyMail.com.

The publication reports that Penn had successfully wooed the woman over many weeks: 'it was calls, flowers, dinners, having her over to his house.'

Moves on quickly: And while for those who have followed Penn's turbulent dating history it may come as no surprise, the 'secret girlfriend' is said to be 'heartbroken'; he is seen here with Cahrlize Theron in March 2014

Moves on quickly: And while for those who have followed Penn's turbulent dating history it may come as no surprise, the 'secret girlfriend' is said to be 'heartbroken'; he is seen here with Cahrlize Theron in March 2014

And while the mystery woman had her suspicions, Sean convinced her that: 'maybe he’s not this jerky-actor type.'

Penn's attention now seems firmly focused on Leila - who he was seen treating to dinner in Malibu on Friday.

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.

The ex-wife: With House Of Cards actress Robin Wright in 2008; the pair have two children, including daughter Dylan - who is older than Sean's new girlfriend

The ex-wife: With House Of Cards actress Robin Wright in 2008; the pair have two children, including daughter Dylan - who is older than Sean's new girlfriend

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.

Leila has also recently worked with Penn - posting a picture of them both in a studio, where they were recording the words for an audio book. 

The first wife: Sean with Madonna in 2013; the couple divorced in 1989 after four years of marriage, but stayed friends

The first wife: Sean with Madonna in 2013; the couple divorced in 1989 after four years of marriage, but stayed friends

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