EXCLUSIVE: Naomi Watts Reveals How 'Book of Henry' Co-Star Maddie Ziegler Helped Her Earn Cool Mom Points

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Naomi Watts isn't a regular mom, she's a cool mom.

The 48-year-old actress told ET during a press tour for her upcoming movie, The Book of Henry, that she scored some major mom points thanks to her co-star Maddie Ziegler.

WATCH: Naomi Watts Says She's on 'Great Terms' With Liev Schreiber After Split: 'There's Good Days and Bad Days'

"My son does tap dance and he was wanting to quit and feeling like he just didn't wanna do it anymore," Watts shared. "And I asked [Maddie] to send a message to him. So I videotaped her and she said, 'Kai, don't quit. You've got to give it your all.' It was just really sweet of her to do that and my son was like, 'Ahh!' He was blown away."

The actress is mom to two boys, 9-year-old Alexander Pete and 8-year-old Samuel Kai, whom she shares with her ex-partner, Liev Schreiber. The couple split eight months ago, but they work hard at co-parenting for the sake of their kids.

"They're very sensitive people, they're fantastic little boys," Watts marveled. "But [I've] definitely had other times where you're like, 'Oh I can't do this!' But that's what being a parent is. You know no one's perfect. You do your best though."

RELATED: Liev Schreiber Kisses Naomi Watts on the Cheek at Tribeca Film Festival, Proves They're Friendly Exes!

During the interview, Watts also joked about having similar haircuts with her boys when she was a little girl, after recently sharing photographic proof on her Instagram page.

"It's so funny because we've all got the same haircut, it's like that old bowl haircut," she said laughing. "They look like me, but also their dad too."