Angelina Jolie and Brad Pitt plan to adopt another child, the actress said in an interview, in which she also confirmed that she donates a third of her income to charity.

"Yeah, yeah. Next, we'll adopt," Jolie said on CNN television's "Anderson Cooper 360" in an interview scheduled to air on Tuesday. The US network released excerpts of the interview on Monday.

Jolie, 31, gave birth to a baby girl, Shiloh Nouvel, in May in Namibia. Megastars Jolie and Pitt, 42, have two other children, Maddox, 4, adopted from Cambodia, and 18-month old Zahara, adopted from Ethiopia.

"We don't know which -- which country. But we're looking at different countries," said the star of the "Lara Croft Tomb Raider" movies.

"It's gonna be the balance of what would be the best for Mad and for Z right now," said Jolie, referring to her older children. "It's, you know, another boy, another girl, which country, which race would fit best with the kids."

Jolie, who serves as a goodwill ambassador for the UN High Commissioner for Refugees (UNHCR), also revealed in the interview that she donates a third of her income to humanitarian causes.

"Yeah, well, I had a stupid income for what I do," she said, laughing. The actress reportedly earned some 20 million dollars for her role in "Mr and Mrs Smith," where she played opposite Pitt.

Jolie said she was fortunate because she was able to see the results of her donations during her trips abroad to refugee camps.

"It's frustrating for people that don't -- that aren't on the field, 'cause you give money, you don't know where it goes. And I've been really lucky, 'cause I can go there," she said.

The interview is to air in full on Tuesday evening on CNN, which is devoting the day's programming to refugee themes to mark World Refugee Day.

Jolie said she became passionate about the plight of refugees and internally displaced people when she read a book about the UN's work with those affected by war and disaster.

"They really are the most vulnerable people in the world," she said. "They really don't have an option for -- it's not just that they're poor. It's not just that they're hungry. It's not just that -- it's that they are in fear...for their lives."

Editor: Donald