Sean Penn has reportedly married his girlfriend Leila George.

The Mystic River actor, 59, tied the knot with his 28-year-old bride in a secret ceremony, according to a friend of the Hollywood star.

Sean and Leila have been dating for four years

The news was broken by producer Mike Medavoy's wife Irena online.

She wrote: "We are so happy for @leilageorge #seanpenn getting married. We love you."

"Thank you for being like family a son to mike we are over the moon to find your soul mate true partner @coreresponse true love that also changes the world for better."

Sean Penn has reportedly married his girlfriend Leila George.

Irena concluded: "You are meant to be together God Bless you both and the family you have joined. Introducing the Penn's #marriage."

She shared picture of what appeared to be the couple's hands wearing the rings.

Leila wore what looked like the same ring this January when she and Sean attended a gala for his relief organisation CORE.

The couple married in a secret ceremony, according to a friend of the Hollywood star

Daily Star Online has contacted a representative of Sean Penn for comment.

Leila is the daughter of Vincent D'Onofrio, who is one year older than her new husband.

Sean and Leila also got a congratulations message Saturday from Josh Brolin, who co-starred with Sean in films Milk and Gangster Squad and will feature with him in the upcoming Flag Day.

Penn used to be married to Madonna

He wrote on his Instagram story: "Happy wedding lovebirds. Our salutations to a beautiful marriage. Sean and Leila."

Sean was previously married to Madonna and US actress Robin Wright and was engaged to Charlize Theron.

The star recently admitted he can be 'difficult' on a personal level.

He also was engaged to Charlize Theron

The star said on The Howard Stern Show in June: "Am I difficult? Yeah I think so. I will say I'm a person who feels and expresses energetically, I've misled people into thinking it's all about me."

Sean added: "I think the interview you're talking about would be a lady named Leila George, she knows me better than I do on this level, that doesn't mean I agree with her perceptions but I certainly find them fascinating."

In the same conversation he referred to Leila as 'The gal in my life.'