Actress Angelina Jolie reportedly conceived her twins through in vitro fertilization.If sources are to be believed, Jolie and partner Brad Pitt turned to fertility treatments to conceive twins Knox and Vivienne."They conceived through in vitro fertilization," Usmagazine.com quoted a well-placed source, as saying."They both desperately wanted more babies soon," the source added. The source further added that Tomb Raider star chose the procedure, "as Jolie wouldn't have to deal with the stress of trying to get pregnant."Knox and Vivienne were born in Nice, France on July 12. The couple already has three adopted kids Maddox, 6, Pax, 4, Zahara, 3, and a biological daughter Shiloh, 2. ... read more »