LOS ANGELES (Reuters) - Angelina Jolie, an advocate for adoption, was determined never to get pregnant until Brad Pitt came along and changed her mind, the actress said in a magazine interview.
The screen idols, dubbed Brangelina, welcomed the birth of their first biological child, daughter Shiloh, in 2006. Their twins, Vivienne Marcheline and Knox Leon, were born in July in France.
Jolie, 33, and Pitt, 44, have been together since 2005.
"I think one of the life-changing things that he did, one of many, is that I was absolutely never going to get pregnant," Jolie said of Pitt in an interview to appear in the November issue of W magazine.
"I never felt that it was the right thing to do. Now I wouldn't trade that experience for the world," Jolie said.
Jolie adopted son Maddox from Cambodia, and later daughter Zahara from Ethiopia, before having Shiloh with Pitt.
Before the birth of the twins, Pitt and Jolie adopted another boy, Pax, from Vietnam.
Jolie told W that Pitt's attitude toward her adopted children helped convince her to have biological children.
"He stopped talking about having other kids in the other way," Jolie said.
"So I suppose in my heart I realized he was happy with them as his children, completely. I knew he would never see them as different, and that gave me a certain peace," she said.
The W magazine interview is accompanied by family pictures taken by Pitt, including a cover shot of Jolie breast-feeding one of the twins.
Jolie and Pitt have emerged as a one of Hollywood's most influential couples, traveling the world for humanitarian causes and managing six children while continuing their movie careers.
Jolie was married and divorced twice, first to actor Johnny Lee Miller and later to actor Billy Bob Thornton, before meeting Pitt.
Pitt was married to actress Jennifer Aniston, but the couple divorced in 2005.
Editing by Jill Serjeant and Eric Walsh