Theron and Penn engaged?

Charlize Theron and Sean Penn are reportedly engaged.

The 'Milk' star and the 'Prometheus' actress, who started dating late last year, decided to get married in the near future during a romantic trip to Paris in November.

A source close to the 39-year-old beauty said Sean, 54, didn't propose in a traditional manner, as they mutually "decided to take their relationship to the next level."

The insider also told UsMagazine.com: "There's no ring, but they are committed."

Earlier this year, Charlize claimed she had no desire to get married.

In June, she said: "Let's put it this way: I never had the dream of the white dress. And watching other people getting married? I think it's beautiful for them, but to be quite honest - it's supposed to be this night of celebrating love, and all you see is a couple separated all night making sure everybody else is okay. It just looks like a lot of work.

"And as you get older, you start sifting through the stuff that really matters."

A source previously claimed the duo, who went public with their relationship at Sean's third annual Help Haiti Home gala last January, were talking about adopting a child together.

Sean already has two children, Dylan, 23, and Hopper, 20, with his ex-wife Robin Wright, while Charlize, 38, has a two-year-old son Jackson, whom she adopted in March 2012.

Penn was also previously married to Madonna.