Sean Penn wants his relationship with Charlize Theron to work

London: Oscar-winning actor Sean Penn will do his best to keep his relationship with actress Charlize Theron steady.

Penn, 53, who made a public appearance with the `Prometheus` star earlier this month, recently revealed about the romance between them, reported Contactmusic.

TV personality Piers Morgan, who had a chat with the `Milk` star, said Penn is interested in staying with the 35-year-old beauty.

"At 2am, Sean came over, and bear-hugged me. `Congrats on a great night,` I said. `And congrats on Charlize too.` He laughed. `She`s a keeper, that`s for sure. Well, I`ll do my best to keep her anyway!`," Morgan said.

During a recent charity event, even Theron was all praise for Penn.

"`I`m so glad you two have got together,` I said, `Sean`s a great guy.` `I know,` she smiled, putting her hand round his shoulder," added Morgan.

Theron and Penn were spotted sharing a kiss at a charity event recently and the couple had earlier fuelled romance rumours when both were spotted vacationing in Hawaii for the New Year.