Charlize Theron is in talks for Sean Penn's 'The Last Space'.

The 38-year-old actress is expected to join 'Blue Is the Warmest Color' star Adele Exarchapoulos in the feature about the refugee camps in Sudan which is being helmed by Penn.

According to The Wrap, several weeks ago the blonde beauty's representative said her participation was ''premature'' and since then there have been no comments on her role in the forthcoming film which is in the early stages of production.

Meanwhile, Theron and Penn who are said to be moving in together are reportedly planning to adopt and the South African actress is eager for her son Jackson, two - who is also adopted - to have a brother or sister.

A source previously said: ''Charlize was an only child and always wished for a brother or sister. It's important to her that Jackson have a brother or sister.''

Penn - who has grown up daughter Dylan, 23, and son Hopper, 20, with his ex-wife Robin Wright - is said to be particularly keen to adopt from Haiti, the island where he has done much charity work since it was hit by an earthquake in 2010.