They conceived through in vitro fertilization," a well-placed source within their camp tells Us. "They both desperately wanted more babies soon." The chance of having fraternal twins at Angelina's age (33) naturally is under 1 percent; with in vitro, the chances are 25 percent. The actress chose the procedure (which can cost around $12,000 a pop) so "she wouldn't have to deal with the stress of trying to get pregnant," the source tells Us. "She could just knock it out." How romantic. UGH.
