Us Weekly confirms the news, and says she isn't announcing it yet as she may figure out a way to sell the story for charity.
One SAG attendee tells Us in its latest issue, on newsstands now, "It was so obvious she was pregnant. You could clearly see the bump's outline."
The source reveals Jolie may sell the confirmation, with the money going to charity.
Reps for Jolie and Brad Pitt, 44, refused to comment.