Jolie, 37, who is a mother of six children, is hiding from the public eyes these recent days because she has been battling morning sickness and wants to keep the pregnancy secret as long as possible, reported Ace Showbiz.
"She had morning sickness and didn't want to draw attention to herself in public. She's focusing on the other children right now, trying to prepare them for the new baby," a source said.
The Maleficent star gave birth to her youngest children, twins Knox Leon and Vivienne Marcheline, in 2008.
"Angelina has been talking about having another child for years now. But Brad kept putting his foot down because of their intense schedules and chaotic lifestyle," the source added.
The couple is parents to six-year-old Shiloh. They also have adopted three children Maddox, 11, Pax, nine, and Zahara, eight.