Charlize Theron and Sean Penn Hit The Beach With Theron’s Son; Sean Penn and Charlize Theron Get Hot and Heavy On The Sand

Charlize Theron and Sean Penn have no trouble with public displays of attention. Sean Penn and Charlize Theron photographed kissing on a Malibu, Calif., beach on an outing with Theron's so on Tuesday.

Charlize Theron shared a very public kiss with Sean Penn while Theron's 2-year-old son Jackson enjoyed the waves. Sean Penn looks like he's been bonding with Charlize's son a lot lately. The three of them have been spotted spending a lot of time.

Charlize Theron is currently starring in Seth MacFarlane's Western genre comedy "A Million Ways to Die in the West," but enjoyed some downtime with new boyfriend Sean Penn.

Sean Penn and Charlize Theron have been dating for a few months now. They seem to love the beach. Sean and Charlize also spent the holidays together in Hawaii.

A source told E! News "They are spending night after night together and moving very fast.  It seems like it's getting serious and that they can't get enough of each other."

Charlize Theron and boyfriend Sean Penn also hit pre-Oscars bash hosted by Oscar-nominated singer Pharrell Williams on Feb. 27. The Hollywood A-Listers got cozy and didn't care who saw it at Eveleigh in Los Angeles.

Pharrell Williams Oscar bash was the first event Charlize Theron and Sean Penn attended together since early January when they went to Penn's Help Haiti Home Gala. Theron and Penn confirmed that they were a couple at the Haiti benefit.

Sean and Charlize were photographed holding hands, cuddling, dancing and kissing during the party.

One partygoer told Us Weekly "Watching Charlize and Sean get down! Both so hot. Charlize and Sean are so gorgeous together, a natural couple."

The source said Sean and Charlize are already talking about getting married. Sean Penn and his ex-wife, Robin Wright, have two children, Dylan, 23, and Hopper, 20. The source said Sean has expressed interest in adopting Jackson.

A source said "Sean is head over heels in love with Charlize, and her son Jackson. He is a totally different person around Charlize, she brings out the gentle and fun side that not many people have seen of Sean. To see this previously surly grown man, romping around Charlize's backyard with Jackson, with a smile on his face would amaze Sean's detractors. Charlize is getting Sean to not take himself too seriously."

The insider continued "The two began talking about marriage in the last few weeks, after Sean moved into Charlize's house. She has never wanted to get married, but seeing how Sean interacts with Jackson, she is having a change of heart. For the longest time, Charlize thought it was just going to be her and Jackson, and she was OK with that. For her to now be talking about getting married is a huge departure for Charlize."