Angelina's twin pregnancy was helped by in vitro treatments. According to Us Weekly, Brangelina had fertility treatments to conceive their twins, Knox and Vivienne, who were born July 12. The source said that the couple was in a rush to knock out the pregnancy -- and also consulted a doctor about the possibility this was natural: "The chance of having fraternal twins at Angelina's age (33) naturally is under 1 percent; with in vitro, the chances are 25 percent." Says Dr. Arthur Wisot of L.A.'s Reproductive Medical Group (who did not treat the couple), "We live in an era of reproductive freedom, so anybody can do anything they want within legal limits.'" Well, maybe not everything in Brangelina's life comes as easily it seems.