August 16, 2016 06:45 PM

Jon Kopaloff/FilmMagic

Katherine Heigl already has two daughters. But her son on the way is the first biological child for the actress — and with being new to pregnancy comes being new to incorporating a growing baby belly into her work.

“Now I feel like [viewers are] only going to be watching that, and [they’re] just going to be like, ‘Oh, she’s hiding her baby bump in this scene,’ ” the star of the upcoming CBS legal drama Doubt tells PEOPLE.

“But yeah, I am,” Heigl, 37, admits. “That’s what I’m pretty much doing … in every scene.”

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The former Grey’s Anatomy star is expecting her third child with singer-songwriter husband Josh Kelley this January. And she says the costume crew behind her new show initially had loftier ideas in mind for her lead character Sadie Ellis.”

“We’re working really hard to try to hide [my pregnancy], and it’s a challenge,” she says. “Because every day my body changes a little bit more.

“We started out with really high hopes of like, fitted, pencil skirts and those really great Victoria Beckham dresses, and that became impossible pretty quickly,” she continues.

“So now it’s a lot of big coats. It’s either a purse, a jacket,” the actress and lifestyle blogger says of the ways the crew has been creative about hiding her bump, joking, “I think I should start carrying a big plant around, honestly — just to shake things up.

“Maybe a dog!” she adds. “Maybe [Sadie] has a small dog that she carries with her everywhere. Like a service dog. I’m gonna pitch that.”

Jen Juneau

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