filed under: Shiloh Jolie-Pitt

With four children to manage and two more on the way, Angelina Jolie and Brad Pitt make it seem so easy. They travel around the globe at a moment's notice with their kids in tow, but sources reveal to Star that behind the scenes, they're losing control of their unruly brood.

With four kids come four very different personalities, which all seem to clash. And the sibling rivalry is brutal.

Maddox, 6, is constantly pushing Pax, 4, around in an attempt to show him who's boss, says a source. "But Pax is no wimp, and he fights back."

But it's little Zahara, 3, who really rules the roost! "She screams and shouts at the boys when she doesn't get her way," says the source. Not even Shiloh, 22 months, is safe — and the toddler has the battle scars to prove it. "Z is always pushing or scratching her."

Zahara's picking on Shiloh is usually motivated by snacks. "Z once clawed Shiloh's cheek after she tried to take her cookie," says an insider who witnessed one incident. "She's always pulling on Shiloh's hair so she can steal her food."

And little Shiloh has more than her hair to worry about! Recently while Shiloh's three older siblings roughhoused, she got knocked down and chipped a tooth! "Angie gets worried when Shi plays with them," says the insider. "She always comes back with a scraped knee or a fat lip!"

In fact, another source says food is a problem with all the kids and blames much of their rowdiness on a poor diet. "They eat fast food, pizza, chips and sugary soft drinks," says the source. "Brad and Angie let them eat what they want because it brings harmony to the chaotic household." To make matters worse, the insider adds, "because bedtime is whenever the kids feel like it, they get overly tired and cranky. Brad and Angelina don't like to be too strict."

She loves danger and dabbling in the dark side. Angelina is an unbelievable lesbian lover. That's where she gets her kicks -- not playing happy family with one man. She loves women too much. It's like a drug and she was hooked.

"I wasn't planning on getting pregnant. I'm the one that got knocked up. Some men have kids when they're not ready and some men know they want to take it seriously and wait until they're absolutely ready. You could say Brad changed me."

"I think I feel so much more for Mad and Z because they're survivors, they came through so much. Shiloh seemed so privileged from the moment she was born. I have less inclination to feel for her... I met my other kids when they were six months old, they came with personality. A newborn really is this... yes, a blob! But now she's starting to have a personality... I'm conscious that I have to make sure I don't ignore her needs just because I think the others are more vulnerable."