‘s son has a plan for his new sibling on the way: go halfsies on the parents!

In a chat with alongside ahead of Wednesday night’s (which the duo are in a row), the pregnant country megastar revealed that her 3½-year-old son doesn’t quite grasp how the parenting dynamic will be shifting between herself and husband when their second child arrives.

“[Isaiah] told me recently comes that Daddy could have that baby and then he could be mine,” said Underwood, 35,

admitting, “His world is about to get rocked.”

“He loves me. He looks at me and talks to me and interacts with me like nobody else on this planet,” she adds. “He’ll stare at me and I’m like, ‘What are you looking at?’ And he’s like, ‘I just love you.

’ What kid does that?”

“He’s just the sweetest,” the praises Isaiah. “He’s just my guy. He cuddles and kisses on me. So I’m hoping this next one has some of that personality.”

Her dynamic with her son has the season 4 champion wondering if her baby on the way will be more of a Daddy’s boy or girl.

“Maybe this next one will be all Mike’s,” Underwood says. “Maybe that will be how it works out. Mike needs some love too.

I feel bad for him sometimes.”

The 52nd annual CMA Awards air Wednesday, Nov. 14 from Nashville at 8 p.m. EST on ABC. PeopleTV, the advertiser-supported OTT streaming service from PEOPLE and Entertainment Weekly, will live stream its Country Music Association Awards pre-show, “PEOPLE and Entertainment Weekly Red Carpet Live: CMA Awards,” beginning at 5:30 p.m. ET/2:30 p.m. PT. The show will wrap before the ceremony begins at 8 p.

m. ET.