Shiloh is anxious for Mommy Angelina to have her baby sisters.  The twins are suspected to be due any day now, though Angelina's has been keeping the due date a secret.  Shiloh hasn't always been this excited though, probably due to her young age.

"It took her a while, but now she's as excited as the rest of the family," a Jolie-Pitt insider tells OK!. "She puts her hands on Angie's stomach to feel the twins kick and she jumps back and starts grinning!"

In the meantime, Shiloh is working on potty training.

"She's got her pull-up diapers and tells Mom and Dad when she has to go to the bathroom," a source tells OK!. "She's trying to get the hang of it all on her own — just like she did with walking."

More details of Shiloh's big sisterhood here.