FYI, Angelina Jolie is Not a Mother Nature!! According to Us Weekly, Angelina Jolie and Brad Pitt used in vitro fertilization to quickly conceive their lovely twins, Knox and Vivienne.
"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. 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."