Angelina Jolie: The Kids Love Playing With On-Set Blood, Wigs

At Monday's London premiere of her new action flick Salt, Angelina Jolie admitted to Us that her kids with Brad Pitt love to play with blood - the fake, behind-the-scenes kind, that is.

The 35-year-old mother of six explained that her kids - including Maddox, 8, Pax, 6, Zahara, 5 and Shiloh, 4 - would often come with her on the set of Salt.

I would bring them in early in the mornings...and I'd let them [use] blood," she said. "So we play together, they try on my wigs, they play with the blood."

But don't worry, they're just having fun. "They know it's all silly! They test the harnesses and we have them flying around. They know what it is," she insisted.

Not to say that Angie didn't shed any of her own blood while making the high-paced action flick. "I have a little scar right here," she said, pointing to the front of her scalp, describing how she "went smack into a table" during an gun-shooting sequence. "It was a little embarrassing."

Were Shiloh and the older sibs in London for the big night? Just "the babies," Angie said of 2-year-old twins Knox and Vivienne. "I'm having some special baby time."

The Academy Award-winning actress went on to say how she and Brad Pitt co-parent. "We're very much a united front," she said. "They can't get Mommy to do something Daddy wouldn't. We're very much the same. But we take turns working and we bring the kids to each other's sets, so we try to stay together."