Carrie Underwood (And Her Baby Bump) Make an Appearance at Keith Urban Show: Watch

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Carrie Underwood performs during the CMA Music Festival on June 8, 2018 in Nashville, Tenn.

Carrie Underwood's next tour isn't kicking off until May since she has a baby on the way, but being pregnant isn't stopping her from taking the stage. 

Surprising the crowd, the singer -- and her well-dressed baby bump -- strutted across the stage to join Keith Urban on their duet "The Fighter" in Nashville Friday night (Aug. 24).

"Will it ever suck getting to sing with @keithurban ??? No. The answer is no," Underwood wrote on Instagram after the concert. "Such an incredible and LOUD crowd at the @bridgestonearenaofficial tonight!!! I know you guys all had a blast! Thanks for having me up there with ya’ KU!"

The performance took place at the Bridgestone Arena as part of Urban's tour.

Underwood announced her pregnancy in early August and shared a look at her growing bump soon after. "Mike and Isaiah and I are absolutely over the moon and excited to be adding another little fish to our pond," she said at the time, referring to her husband and first child, son Isaiah.

Check out a clip of her performance with Urban below.