Charlize Theron and Sean Penn have sparked marriage rumours.

The 38-year-old actress has been dating the 53-year-old actor for around eight months, although they have been friends for 18 years. This summer they will be working on the movie The Last Face together, with Charlize starring in the project and Sean taking on directing duties.

It's been claimed they are also planning to make their relationship more permanent.

"They want to get married very soon," an insider claimed to Us Weekly magazine.

The source also suggests the pair are considering adopting a baby together. Charlize is already mother to two-year-old Jackson, whose adoption was announced in 2012. "[She] always intended to have another child," another source explained.

Sean is also a father, having daughter Dylan and son Hopper with his ex-wife Robin Wright. Apparently Charlize is in no doubt that he will make a great dad to any children they have.

"Charlize has seen Sean grow up," a source said. "He's a wiser soul and much more patient."

The actor has also apparently become a "strong role model" to Jackson, which is another reason why Charlize is sure he is The One.

"They're looking to the future with a lot of hope," another source explained.

The couple prefer to keep their romance private for the most part, although they have attended events together. In May Charlize also opened up a little about the relationship, admitting it took her completely by surprise.

"What I guess I am trying to say is: a friend kind of stepped into that role, and I really didn’t see it coming. Sean and I have known each other for 18 years. We were just really good friends. And it’s been slow going because you are aware that you could screw that up and lose it. We had to think about it," she told Vogue magazine. "But at the end of the day, it was somewhat effortless. It just kind of naturally happened, and before I knew it, I was in something that was making my life better - the people who really love me can see the effect it has had on me."

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