R&B legend Brandy suddenly walked off stage at the United Center during her and Monica's "The Boy Is Mine Tour" on Saturday night, leaving concertgoers perplexed.

Videos posted on social media showed the co-headliners performing a duet when Brandy appeared to experience technical issues and then exited the stage without saying anything. Monica continued with the performance and later wrapped up the concert, but the night ended without an expected performance of the duo's hit duet "The Boy is Mine."

Fans were perplexed, with many questioning the abrupt move on social media - and some going as far as to ask for a refund.

"Brandy and Monica, yall are my girls—but what was that ending? Chicago, I’m sorry," one social media user said.

"I hope Brandy is ok… Chicago is not," another stated.

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