Cover Story: Shiloh Can't Wait to be a Big Sis!

Angelina Jolie and Brad Pitt have much to celebrate with the impending arrival of their twins and the recent success of Angie's film Kung Fu Panda at the box office. And no one is more excited than their youngest child, 2-year old Shiloh.

The towheaded tot is finally coming around to accepting that she's going to be a big sister and friends say it's a big relief in the Jolie-Pitt household.

"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!"

Little Shiloh is taking other baby steps as well. The 2-year old has begun sleeping in a big-girl bed and is even almost potty trained.

"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."

For the entire scoop on how Shiloh is coping with being a big sister, pick up the new OK! — on newsstands everywhere Thursday!