"I feel like he kind of feels... he hears me singing whether he would like that or not," Carrie said to host Jimmy Fallon. "I mean, that's what I do, he doesn't have a choice."
"I do feel like I have to sing good all the time," she continued. "Like, if I'm just in my car driving, I feel like I have to make it good because he's listening. He's always in there."
Carrie is expecting her first child with husband Mike Fisher this spring. They revealed they're having a baby boy a few weeks ago. The parents-to-be wed in July 2010 after getting engaged in December 2009.
During the same interview, she admitted that she's not the only one who sings around the house. Mike totally busts out his inner "bro" and gets down to everyone's secret, favorite jam.
"It's always surprising...He doesn't actually know the real lyrics to any song, except for like, 'Whoomp! (There It Is)' will come on the radio and he knows every word to that. Yet, I'll ask him what my current single is and he sings all the wrong words. He has no clue," she added.
Check out Carrie's entire interview with Jimmy below.