Carrie UNDER PRESSURE

Does Carrie Underwood have what it takes to fill Katy Perry's American Idol seat?

Following the Aug. 1 announcement Fa that Carrie Underwood would be taking Katy Perry's seat as a judge on American Idol, the "Before He Cheats" singer, 41, confessed she had "a big problem." "I can't lie. I just can't. You can tell," she said on Good Morning America. "Hopefully, I'll be very honest, but very encouraging."

While Carrie's purported honesty may ruffle the feathers of some aspiring idols, she actually has a lot more to worry about with her new gig. "Carrie is excited, but now that it's official, she's stressed out and under a lot of pressure," notes an insider. "Though she isn't admitting it, Carrie thinks she may have taken on too much."

One of the biggest issues is that zany Katy, 39, left some pretty steep platform heels to fill. Case in point: Lamenting Carrie's selection, a critic for The Daily Beast wrote that while Katy was "damn funny," Carrie is "not exactly known for her huge personality." Ouch.