Brad Pitt and Angelina Jolie Credit: NJO/

It wasn't your average Jolie-Pitt family meeting.

On a recent spring day, Brad Pitt gathered his six kids -- Maddox, 10, Pax, 8, Zahara, 7, Shiloh, 5, and twins Vivienne and Knox, 3 -- as he presented love Angelina Jolie with a very special present: A tablet-shaped diamond engagement ring -- estimated at 16 carats and worth $500,000 -- which he helped design with jeweler Robert Procop.

"Angelina cried and smiled" at the proposal, a confidante tells the new Us Weekly, out now.

And the children, who had been extremely eager for their parents to wed after seven years together, were equally overjoyed, the source adds. "Everyone hugged once she put [the ring] on. She went around and showed it to each of the kids."

As the world now knows, Jolie, 36, quietly debuted that long-awaited ring at an April 11 private viewing at the Los Angeles County Museum of Art, with startling photos and a confirmation from jeweler Procop and then Pitt's manager emerging two days later.

"Angie considers herself bonded to Brad for life," adds the source.

For much, much more on one of the biggest Hollywood engagements ever -- how son Maddox led the kids to pressure mom and dad to get hitched, their low-key wedding plans, and what Jennifer Aniston really thinks -- pick up the new Us Weekly, on stands Friday!