Even Megan Fox‘s Teenage Mutant Ninja Turtles: Out of the Shadows costars are rooting for her and Brian Austin Green to make it as a couple.

While Fox, 30, was “under the weather” and unable to attend the world premiere of TMNT in New York on Sunday, her fellow cast mates were quick to praise their pregnant costar and show their support for her growing family.

Brittany Ishibashi, who plays Karai in the film, told PEOPLE she was excited to hear of Fox’s pregnancy and recalled her dedication to her family while on set.

“I have a 2-year-old. We bonded over kids. And I worked with Brian Austin Green a few years ago on Desperate Housewives. He’s such a sweet guy. They are both such sweet people – super chill. They’re very spiritual people, very kind and generous,” said Ishibashi. “And she’s an amazing mother. She was always talking about her kids and FaceTiming with her kids. And I think Brian’s a great dad. They’re such cool people.”

Ishibashi also mentioned that she felt hopeful after learning that the couple recently vacationed together in Hawaii. “I was like, ‘Aw, there you go, guys,’ ” she said. “And the big island on Hawaii is a very special place, very spiritual – that’s where they got married, at the Four Seasons on the big island of Hawaii, at Hualalai. And they were back there.”

And when she wasn’t talking to her own kids, Fox happily took on the role of “Mama Bear” while filming.

“She’s an amazing mom,” Pete Ploszek, who plays Leonardo, said of Fox’s pregnancy. “And she’s a real Mama Bear, in the sense that she takes care of us [Turtles], being the savvy industry vet. I saw Brian a lot on movie one, he hung out a lot. So we all became close with Brian. He’s a super dad, too.”

Ploszek also indicated that he was pleased when the couple recently vacationed together. “Exactly, fingers crossed,” he added.

And costar Stephen Amell joked that he had fun trying to get Fox to admit that she was pregnant after the film wrapped.

“She wasn’t pregnant when she filmed,” noted Amell. “But we did some additional photography, and I think she was pregnant then, and then we saw each other at WonderCon, and, as a guy, I wasn’t going to say anything. So I just started baiting her with questions: ‘Hey, you want to have a glass of wine? Do you want to do bumper cars?’ And she said, ‘I’m pregnant.’ I’ve never met Brian. But I’ve spent a lot of time with [him] watching the original 90210, and I hear he’s a great guy.”