Actors Angelina Jolie and Brad Pitt sit at their table at the 13th annual Critics' Choice Awards in Santa Monica.[Agencies]

Angelina Jolie's brother has confirmed that the actress is to adopt another African girl with partner Brad Pitt.

The couple plan to tour orphanages in March in search of a sister to bond with Ethiopian daughter Zahara.

James Haven is quoted in the Daily Mirror as saying: "They are creating one big family and will keep adopting as long as they are able to.

"Angie and Brad talk about how much they have been taught by their kids. In many respects Angie saved Zahara's life and there are so many more children whose lives she could save and she talks about that constantly."

Jolie and Pitt already have three adopted children - two-year-old Zahara, six-year-old Maddox from Cambodia, and four-year-old Pax from Vietnam - as well as 20-month-old biological daughter Shiloh.

They were originally reported to be planning a second African adoption last August.