According to a report from US Weekly, Penn popped the question to the Mad Max: Monsters Fury star during a romantic trip to Paris in November.
The pair, who have a 15-year age gap have both been ‘married’ before, Penn, 54, to Madonna and then to Robin Wright and Theron, 39, though not legally married, wore a committment ring during her nine-year relationship to Irish actor Stuart Townsend.
Theron has previously said she’s not a fan of marriage, which makes the engagment to Penn quite surprising to those close to the couple.
“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, usually I’m sitting there just devastated,” she said. “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.”
However, in June is told Vogue that she is not afraid to make a long-lasting commitment.
“I want the long-term relationship,” she said.
Well done Mr. Penn, you’ve got yourself a good one there!