The 52nd annual CMA Awards air Wednesday night on ABC

By Brianne Tracy and Janine Rubenstein
November 14, 2018 04:50 PM

From releasing a joint single to combining forces on tour, Carrie Underwood and Brad Paisley have done it all together.

Now, the country superstars are gearing up to host their eleventh consecutive CMA Awards together on Wednesday — and yet they say still haven’t gotten sick of each other thanks to a trick they’ve learned from their own respective marriages.

“We spend a lot of time apart,” Underwood, 35, tells PEOPLE. “I feel like that’s important for any ‘marriage,’ work or real. Gotta spend some time apart.”

Paisley, 46, agrees and adds, “In each of our marriages, it’s that way. [We spend] a lot of time apart because of separate careers and stuff like that.”

“But, no, it’s a great thing,” he continues. “The chemistry we have up there … I think you can take that for granted, but it’s really rare.”

Paisley is married to According to Jim alum Kimberly Williams-Paisley and has two sons — William, 11, and Jasper, 9. Underwood is married to professional hockey player Mike Fisher and has a 3-year-old son, Isaiah.

Hosting this year is going to be a little different for the “Cry Pretty” singer due to the fact that she’s currently pregnant with her second child, and she even shares how Paisley reacted to her growing bump.

“When I saw Brad after not seeing him for a little bit and I had kind of popped, I walked in the door and he said, ‘Holy cow!'” Underwood says.

“Poor choice of words,” she continues. “It is different. Mainly it’s a wardrobe thing and I don’t move as fast as I would like to. There’s a lot of quick changes and running from one side of the stage to the other.”

Check out PEOPLE’s full CMA Awards coverage to get the latest news on country music’s biggest night.

While Paisley says he fully expects Underwood to be in a “robe and sweats” before the show’s over, Underwood says she’s opting for a lot of spandex.

“It’s amazing because the majority of designers do not make maternity clothes,” she says. “So, I’m squeezing myself into things not meant to go on [my] body, but I’m sorry when I give them back and they’re all stretched out. Sorry designers. We’re pulling a lot of archive things that they don’t need anymore, and I have no idea what we’re gonna end up with. We’re not forcing anything — except that zipper.”

When it comes to Paisley’s outfits for the show, Underwood says she was unsuccessful in her attempts to get him in a man romper.

“We’ll see,” Paisley says. “In male sort of fashion, we’ve turned this corner where for a while they were trying things. But now its almost like people just gave up. It’s just flat brim hats and skinny jeans and whatever. You know what I mean?”