Angelina Jolie says Brad Pitt has had to become tougher on their children.

The Oscar-winning actress raises six children with the actor - Maddox, 10, Pax, eight, Zahara, seven, Shiloh, five, and three-year-old twins Knox and Vivienne - and while she has always been the stricter parent in the past, Brad has now had to be more involved with the discipline.

She said: "I used to be the tougher parent but since the birth of the twins, Brad's had to play bad cop more often. It also depends on which of the children we are talking about. Brad has always had this incredible bond with Mad, who's very smart, and Brad loves teaching him about history and art and culture - it's an amazing thing to watch them together. I think I'm a little closer to the girls, maybe, but he's always making them laugh. The children are usually very well-behaved though."

Angelina says she and Brad love having a big family and like to spend quality time together before they all go to bed.

She told Britain's OK! magazine: "Our happiest moments are probably in the evening before the kids go to bed. We often play together in our pyjamas after dinner and it's like having a party sometimes where we're all dancing and jumping around and being silly. That's when you really feel the beauty of having a family. It's our little world."