Charlize Theron and Sean Penn have fuelled romance rumours by going grocery shopping together in the US.

The Oscar winners - who are thought to be an item after they were spotted in Hawaii together last year - were photographed picking up food and other household items in a Whole Foods store in West Hollywood, accompanied by Charlize's two-year-old son Jackson.

While the actress shopped, Sean entertained the tot as he sat in the trolley.

The latest sighting of the new couple comes soon after they seemed to go public with their romance at the actor's Help Haiti Home gala.

Charlize, 38, and Sean, 53, were seen talking and laughing during the event.

A source told Us Weekly: "It looks serious and comfortable."