The "Mr. and Mrs. Smith" stars, who are staying at the elegant Florentine-styled palace in southeastern France, already have a number of contingency plans for the twins' births.
Included in these plans are a helicopter and military-trained pilot who can fly the couple to the nearby Princess Grace Hospital for the births.
The 32-year-old actress also has two private nurses, a gynecologist and a midwife on hand in France for the occasion.
The Daily Mail said Jolie, who wants to honor her Gallic descent by giving birth in France, has endured gestational diabetes, painful swelling and low blood pressure during her pregnancy.
Celebrity Families of 2014 [PHOTOS]