Underwood told Fox News Edge's Marissa Stevens that it's because they're very different from each other.
"They're not competing with each other in any way so it will be really cool to see what happens." Underwood said.
The former champ also said she thinks American Idol still has staying power after all these years.
"I remember when I was on there, they were like 'oh, this is season four, there's going to be some natural erosion, there's not going to be as many viewers' and then the next year was bigger. What other series on television, after season eleven still has 20 million viewers?"
Check out the entire video to get a shoutout to the Natural State.