Angelina Jolie and Brad Pitt really want their soccer team of kids! The super couple allegedly used fertility treatments to quickly conceive the latest additions to their clan, twins Knox and Vivienne. "They conceived through in vitro fertilization," an insider tells Us Weekly. "They both desperately wanted more babies soon."

The couple has been very vocal about wanting a big fam, but there's another reason why they're so eager to multiply. "If we're going to have 10 kids, we'd like to raise them while we're young," Angie told the British version of Elle last year. The couple chose to have the procedure so "she wouldn't have to deal with the stress of trying to get pregnant," the insider tells Us Weekly. "She could just knock it out." And here's an added bonus: in vitro fertilization increases the chance of having fraternal twins at Angie's age from under 1 percent to 25 percent! Talk about efficiency. Well, six down, four to go!