Credit:; Jun Sato/

Angelina Jolie and Liev Schreiber weren't the only folks playing shoot 'em up on the set of Salt -- their kids got in on the action, too!

Salt star Schreiber's sons with love Naomi Watts -- Sascha, 3, and Samuel, 20 months -- hung out with Jolie and Brad Pitt's kids on the studio lot.

"There were playdates which were amazingly fun!" Schreiber, 42, told at Lexus' Darker Side of Green Debate at NYC's Bowery Hotel Tuesday. "We were playing shoot ups inside the studio, and [our kids] were having squirt gun fights out in the lot," he explained.

And Shiloh and the gang played nice, too. "Everyone got along!" Schreiber said, adding that his famous costar was "very keeping it cool around her kids, or at least protecting them" from too many prying eyes.

As for acting with Jolie? "It was great! I didn't know what to expect," he told Us. "I was very impressed with how normal she was, and how easy she was to work with."

Her most admirable trait: "I think it was her diligence...and her commitment to the job. She works her butt off."