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Five Facts about Brad and Angelina’s twins on their 4th birthday

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Vivienne Jolie-Pitt (Splash News)

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Knox Jolie-Pitt (Splash News)

Who could have imagined, back when Angelia Jolie and Brad Pitt first started up a romance after meeting on the set of 2005 movie "Mr. and Mrs. Smith," that all things Brangelina (especially their brood of six) would continue to fascinate the world seven years later. The most recent additions to the family are their mixed-gender twins — daughter Vivienne and Knox — who turn 4 on July 12. In honor of the mini-milestone, here are five facts about the two tykes you might not have known.

[Related: Angelina Jolie gets visit from twins while filming 'Maleficent' ]

1. Actor Jack Black was the one who revealed to the world that Jolie was pregnant with not one, but two babies.

While in Cannes promoting their animated movie "Kung Fu Panda" in May 2008, the two sat down with Natalie Morales for a "Today" show interview. When the conversation turned to the fact that Jolie, Morales, and Black's wife, Tanya, were all expecting, Black turned to Jolie and said: "You're going to have as many as 'Brady Bunch' when you have these." Morales quickly jumped on the slip: "So is that confirmed? Is it two?" she asked. "Well Jack just confirmed it actually," Jolie laughed, as a look of terror came across Black's face. "Is that true?" he asked. "Yeah, you did!" Jolie giggled. "Oh, man," Black said putting his hand to his face. "Sorry." Well, the world was going to find out soon enough anyway, Jack.

[Related: Angelina Jolie's engagement ring vs. the one Brad Pitt gave Jen Aniston]

2. Their names — Knox Leon and Vivienne Marcheline — have family meanings.

Knox was the middle name of Pitt's grandfather, Hal Knox Hillhouse, while Jolie's great-great grandfather was named Leon. Vivienne's middle name, Marcheline, is in honor of Jolie's mom Marcia Lynne "Marcheline" Bertrand, who lost her battle with ovarian cancer a year and a half before the twins were born.

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Brad, Angelina, and the twins. (Splash News)

3. The first photos of the twins fetched a record-breaking amount of money.

People magazine reportedly paid between $11 million and $14 million for the first shots of the babies, still the most ever paid for photos of celebrity kids. The cover story featured the newborns along with their parents and a "19-page family album" in the August 18, 2008, issue, which became one of the magazine's best-selling issues ever, selling more than 2.8 million copies. Brangelina donated their proceeds to charity.

4. Knox and Vivienne have been to more countries than you probably have.

Born in France, the twins have been spotted in various far-flung destinations during their short lives, including Budapest, Hungary, where their mom was working on her directorial debut "In the Land of Blood and Honey" a few years back. Last summer, they joined the rest of their siblings for a bowling outing in Malta, then hit up Tokyo in November where Papa Brad was promoting "Moneyball," and were most recently photographed visiting a costume-wearing Angelina on the set of "Maleficent" in Buckinghamshire, England, just last month. Not a bad travel journal for kids just turning 4!

5. An '80s sitcom star is rumored to be their godmother.

Though it's never been confirmed, rumor has it Mindy Cohn, who played Natalie on the iconic '80s sitcom "Facts of Life," is the godmother of the twins. The actress has become close friends with both Brad and Angelina and reportedly often visits with the couple during their travels. Perhaps one reason they trust her as a close confidante is that she doesn't have loose lips. On a recent episode of "Watch What Happens Live," host Andy Cohen asked Cohn several questions, including when she felt "Facts of Life" jumped the shark, which castmember lost her virginity first, and if she was indeed godmother of any of the Jolie-Pitt kids. The godmother question is the only one she pled the fifth on!

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