Angelina Jolie isn't about to let a bit of needle-inflicted pain stop her from establishing 3-month-old wonder twins Vivienne and Knox as their own distinct little poopie-pantsed people.

Angelina debuts her post-twins bod at the New York premiere of "The Changeling" on Oct. 4.

At Saturday's New York premiere of "The Changeling," the sublime Oscar winner donned a body-hugging black strapless Versace dress that highlighted the new ink indelibly etched on her arm.

Just as she did with tots Maddox, 7, Pax, 4, Zahara, 3, and Shiloh, 2, Jolie tattooed the geographical coordinates of Vivienne and Knox's birthplace on her upper left limb.

But instead of going the easy route by adding just one line of numbers with, say, an "x 2" at the end, she's had two sets of identical longitudinal and latitudinal digits engraved to mark the double bundles' big debut in Nice, France, on July 12.

"Everybody's great," the actress enthused to People as she and a scarf-bedecked Brad Pitt made their first post-twins red carpet appearance together, signing autographs, taking pictures and shaking hands with the hundreds of screeching fans who turned out for the occasion. "The babies are getting big and healthy and developing personalities."

Those personalities? Knox "seems more relaxed," she shared with reporters at a press conference on Friday (via the London Daily Mirror), while Vivienne is "more loud."

Meanwhile, the tattoos weren't the only thing Angelina, 33, showed off at the premiere. The newly dark-locked, fresh-faced stunner was also styling a slightly more robust figure, a welcome transformation from the rickety frame she sports in "The Changeling" and "Wanted."

Angelina keeps Brad's hand firmly suction-cupped to her behind on the red carpet.

Pitt, for his part, appears to be enjoying her curvier silhouette: His hand rested comfortably on her posterior as they did that wax-figure-or-real-thing pose they do so well on the red carpet.

(By the by, Angelina's glow and Brad's handsiness belie Star's current cover claim, which trumpets, "She's barely eating ... [and] won't even let Brad touch her.")

"I run around with all the other kids, and I'm breast-feeding, which I think is a part of your body's recovery," said Jolie of her postpartum routine. "I feel great [and] feel very happy that they're healthy."

And creatively engaged. Before the premiere, she treated her three oldest tykes to a trip to one their favorite Manhattan destinations, Lee's Art Shop, where they loaded up on paint and craft supplies as shutterbugs surrounded the place.

"We went to an art store with the kids, and it was nice inside, but a little chaotic outside," Jolie understated to USA Today of the outing, noting that while she and Brad were working the red carpet, their tykes were "painting at the Waldorf-[Astoria Hotel]. Hopefully not on the walls."

As for how the rest of the brood is adapting to the twins, she says they're eager helpers -- sometimes too eager.

"They're funny," she told Us. "They want to help a lot now, but they're still so little, so it's like trying to change a diaper, you have to be careful because they squeeze them so tight."

Angelina beams as Brad whispers sweet nothings into her ear.

And despite recent rumors that the admittedly sleep-deprived megastars are already thinking about adding another ankle-biter to the family's rapidly swelling ranks, possibly from Latin America or Namibia, where Shiloh was born, Angelina says they're not quite ready.

"I think we're going to wait a little while," she downplayed to People.

Still, it's clear that Jolie will eventually have enough coordinates to cover up the last remnants of the dragon and the first name of her head-scratching second husband Billy Bob Thornton that once decorated her arm.

"We are going to have more kids one way or another," she added to reporters.

Brad and Angelina's goal for a soccer team-sized clan will likely make carving out kid-free together-time even more difficult than it already is.

"Even if we lock our door, the children come knocking," she laughed at Friday's press conference. "We often try to have a bath alone together at the end of the night and sit and talk, but they hear the water and want to jump in."

Crowded tub or no, "It's fun and it's lovely," the actress said. "The thing about having six is once you've passed three or four, it's so crazy anyway that it's just more chaos and it's all OK."

The Jolie-Pitts recently relocated to Berlin, where they're reportedly hunkering down in a palatial, $36,000-a-month estate while Brad shoots Quentin Tarantino's war flick, "Inglorious Bastards," although on Monday, they popped up in New Orleans, where they own a $3 million mansion in the French Quarter.

The actor was spotted cruising around on a bike with a notebook emblazoned with the face of Barack Obama in his hand, while Angelina took Pax, Shiloh and Zahara (not to mention a couple of security guards) on a snack run.

Not that they're bidding adieu for good to their expansive, rented chateau in the South of France, where they spent the last five months.

"We love France. We'd like to spend more time there again," notes Angelina (via OK!). "We've got a lot of wonderful friends. We love the air, and the life, and the other children we met. It was a beautiful, beautiful quality of life and beautiful place to live."

And unlike some stars who might take such a rarefied existence for granted, she seems to appreciate how lucky she is.

"I feel so blessed that every day I wake up and I live with my favorite people in the world and my best friend," gushes Jolie. "I live with Brad, who, more than me, has had to deal with fame, so we share that together and we find a way to make it fine and fun."