Angelina Jolie and Brad Pitt may prefer to keep the inner workings of their relationship on the QT, but the actress' lately blabby brother seems more than happy to unplug his PR-savvy piehole, this time to proclaim the comely, kiddie-gathering couple the greatest pairing since chocolate and peanut butter.

"Brad has changed my sister a lot," James "I Didn't French Angie at the Oscars" Haven enthuses to Grazia magazine (via Us Weekly, which just last week was kvetching about Jolie's so-called "twisted double life"). "They have an extraordinary bond, but not on the usual level. Brad is so strong for her; when she feels vulnerable, he has the most incredible strength. She says she couldn't have adopted more children after Maddox without him."

But it's not just the glamorous earth mother, 31, who has been transformed, says her Chatty Cathy of a big brother. The megastar, 43, who just two years ago was tyke-less and not quite divorced from Jennifer Aniston, is now "totally committed" to life as a dad.

"He has changed so much," gushes Haven. "He's completely involved -- he loves the children and is terrific with them."

So family-oriented are the world's most famous flames that "there is no limit to the children she and Brad are adopting," he reveals. "It could be scores. I've never heard an end number in their conversations."

But will the Jolie-Pitts, who last month added 3-year-old Vietnamese orphan Pax Thien to their tot-filled melting pot, soon provide Maddox, 5, Zahara, 2, and Shiloh, 11 months, with another playmate?

Britain's tabloid-tastic News of the World claims Angelina has her eye on a 1-year-old girl from the African country of Chad, ostensibly to "balance" the brood (Zahara was born in Ethiopia).

But a local official assures Us that the Jolie-Pitts have not filled out an adoption application.

Of course, that doesn't necessarily mean they (and the four nannies the mag says they keep on staff) won't need oodles of poopie diapers in the coming months.

"Brad has told people he and Angelina want to have two more kids in 2007," says a "source close to the actor." "Their plans include another biological child."

Chimes in another insider, "They want seven or eight children."

As for tabloid talk that Jolie wears the pants -- albeit incredibly stylish and sexy pants -- in the relationship, her brother acknowledges she prefers to be in charge, but insists that's a good thing: "All great leaders are controlling."

Still, he denies there's a power struggle.

"I have never seen any sign of tension between them," marvels Haven. "They make all their decisions together. It's rubbish that she tries to control him. They have a balanced relationship; they each do their stuff. I've never seen moments where one is nagging or controlling the other."

He then offers his take on why they're perfectly matched, a theory that runs somewhat counter to the prepossessing pair's preferred poker-face pose in paparazzi pics.

"The great thing about Brad and Angelina is that they really get each other's sense of humor and make each other laugh a lot," he says. "They talk about politics a great deal and are very creative together with the projects they are working on."

He then makes a bold prediction -- one a more superstitious type might worry could jinx the romance.

"If it keeps going the way it's going," he says, "they'll be together for life."

That's news to Star, however, which is convinced happily-ever-after just isn't in the cards for Brangelina.

"Is It Over?" screams this week's not-at-all sensationalistic cover. "Angelina Walks Out on Brad! ... & Dumps the Kids!"

The New York Post believes Star, like Us, is peeved that People keeps scoring the exclusive pictures of the family, hence the headline about Jolie supposedly zipping off for a quick, work-related trip to Chicago, and letting Maddox, Zahara and Pax socialize at a daycare on the Warner Bros. lot.

"I wish people would leave them alone," Pitt's rep tells the paper. "They're trying to do something good."

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