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The making of Kung Fu Panda 3 really turned into a family affair.

Not only did Angelina Jolie's kids Pax, 12, Zahara, 10, Shiloh, 9, and Knox, 7, record animal voices for the movie, but co-star Jack Black's son Sammy, 9, did, too.

"My boy actually has a voice in it," the funny man told E! News' Will Marfuggi while promoting the third installment of the hit franchise. "He plays one of the bunnies. I wish there was only one bunny so I could say, 'My boy plays the bunny,' but he's like one of the bunnies. There's like a thousand bunnies."

And Dustin Hoffman's grandson Gus is also heard in the movie.

Angelina Jolie

Todd Williamson/Getty Images

Jolie recently revealed that her kids weren't jumping at the opportunity to be in the flick.

"They were kind of shy," she said. "They don't really want to be actors, but I didn't want them to miss the opportunity. They came in, and they had a lot of fun with it."

Black says his kids are "stoked" about the movie, but said, "they have to be a little contrary. It's part of being a kid. It's like, your dad is not the cool one. No matter how cool your dad is they have to rebel against me."

Franchise newcomer Kate Hudson said, "My kids have always loved the Kung Fu Pandas, so this is really exciting for me because, you know, I'm cool mom right now."

Kung Fu Panda 3 is in theaters on Jan. 29.