Sean Penn proposes to Charlize Theron?

London: Hollywood star Sean Penn has reportedly popped the question to his actress girlfriend Charlize Theron, which has apparently made her very happy.

The 53-year-old Oscar-winner has been dating Theron, 38, since December, reportedly.

"She`s over the moon and loves Sean to pieces. He`s the most passionate guy she`s ever known and feels he`s the right man for her," a source said.

The actor was previously married to Madonna for four years. He has two grown-up children from his 14-year marriage with `House Of Cards` actress Robin Wright. They got divorced in 2010.

Penn and Theron sparked dating rumours after they were seen cosying up during Penn`s Help Haiti Home gala in January.