Angelina Jolie and Brad Pitt by Jeff Vespa/WireImage.com Angelina Jolie and Brad Pitt by Jeff Vespa/WireImage.com

After weeks of speculation, it's looking a bit more official: Brangelina are expecting a new baby.

Following extensive guesswork and intense monitoring of the size of Jolie's abdomen in recent weeks, her protruding baby bump was unmistakable Saturday at the Film Independent's Spirit Awards, as she hit the blue carpet in a body-hugging black dress.

A source tells People the pair is "thrilled to be adding to their brood," which already includes Maddox, 6, Pax, 4, Zahara, 3, and Shiloh, 1. Pax was officially adopted by Jolie and Pitt last week.

Clearly these two are ready for "Extreme Supernanny: Jolie-Pitt Edition." - Anna Dimond