"People thought they would have to step on egg shells around her," showbizspy.com quoted a source as saying.
"She's got her personal stuff going on, but she leaves that at the door. And behind the scenes she's a funny, loving girl, not an ounce of diva in her. They've all bonded," said the source.
The 33-year-old actress, mother of Suri, six, eats her lunch with the rest of the cast.