Actor Brad Pitt has been photographed playing 'dad' to Angelina Jolie's young son - sparking more speculation that he is enjoying a romance with the stunning actress.

Brad, whose relationship with Angelina was said to be one of the reasons he split from wife Jennifer Aniston, was snapped helping three-year-old Maddox build sandcastles on an African holiday while Angelina looked on, celebrity portal Femalefirst reported.

Brad, who has made no secret of his desire to start a family, joined Angelina and her adopted Cambodian son for a few days in the secret location.

A source told Britain's The Sun newspaper: "They went to extreme lengths not to be spotted, hiring private jets, private villas and security. But they seemed very relaxed once they were out on the beach with Maddox."