Angelina Jolie and Brad Pitt are to adopt a Vietnamese boy, it has been claimed.

The couple - who have three children, adopted five-year-old son Maddox and two-year-old daughter Zahara, and their nine-month-old daughter together Shiloh - are reported to have filed adoption papers.

A source says : "Angelina and Brad have filed papers with the US Citizenship and Immigration services to adopt a boy from the Tam Binh orphanage in Ho Chi Minh City."

The couple visited the orphanage together in November and Angelina returned alone last month.

'The Good Shepherd' actress has made no secret of her desire to adopt children from all over the world.

Angelina recently said: "If we're going to have ten kids, we'd like to raise them while we're young."

Angelina adopted Maddox from Cambodia and Zahara from Ethiopia. Brad became joint guardian of the children when he and Angelina's relationship became serious.

The 31-year-old actress gave birth to their daughter Shiloh in May last year.