Hollywood - According to reports, Brad Pitt and Angelina Jolie used in vitro fertilization to conceive their twins. US Weekly is reporting that the couple wante dto have babies, and turned to in vitro fertilization to help. This led to the pregnancy and birth of twins Vivienne and Knox. The 33-year old Angelina Jolie apparently chose the $12,000 procedure to try and boost her chances of getting pregnant. ...