Carrie Underwood Performs 'Heartbeat' On X Factor
She also had some advice for the contestants on the UK-based show. "Every time you're onstage, act like it's your last time," she said. "Leave it all out there. Try not to be nervous, it's impossible, but just give it your all."
As for singing in front of Cowell again, Underwood admitted that doesn't get easier. "It's been a while," she said. "It's still intimidating, but it's great to be here." Watch it here.
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