The 43-year-old actor has admitted it's tough staying in shape

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

He continued: "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."

The couple have three adopted children, Maddox, 6, Pax, 4, Zahara, 2, and 20-month-old biological daughter Shiloh, and Angelina has previously spoken of her hopes to have a "balanced" family.

She said last year: "Should you balance the races, so there's another African person in the house for Zahara, after another Asian person in the house for Mad? We think so. Shiloh has Brad and me to look at."