The country singer totally surprised Brad Paisley's fans at his Nashville show Saturday night.
"Just got to join the great @BradPaisley on stage at the Bridgestone Arena tonight in Nashville! I'm always so amazed and proud of my friend!" she tweeted.
The two of them sang their hit song "Remind Me".
Carrie also met up former The Voice winner (and Brad's opening act) Danielle Bradbery backstage before her duet with Brad.
"AND I got to meet THE one and only @DBradbery Such a sweetie!" Carrie bragged about on Twitter.
Danielle has called Carrie her direct musical influence before.
This isn't the only big thing Carrie's been up to lately. She's reportedly ready to have a baby with her hunky husband Mike Fisher. Read about that here.
Watch Carrie and Brad sing "Remind Me" below.
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Gallery | Carrie Underwood Hits the Stage