XO singer Beyonce seemingly flared up rumors that she and Jay Z are heading for divorce when she had a shocking breakdown during a performance at the couple's On The Run tour.

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According to Radar Online, she prepared to sing her song Resentment in Los Angeles Sunday night, which tells the story of a woman scorned after her man cheated on her. While she was extremely emotional before she began singing, it was difficult for her to continue the line that originally stated, "I know she was attractive, but I was here first."

An insider told the site that she stopped after singing "but."

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"Not long after, she stopped singing and seemed overcome with emotion. The camera was cut in tight so you could literally see her eyes welling up before she closed them and attempted to collect herself. She didn't even hold the mic put o her mouth! She was just wailing it out and really seemed lost in her own world."

The same source also said that Beyonce was not the same after and stayed in a somber mood for the remainder of the show, including the performance with her husband.

"Any time she interacted with Jay Z, it seemed like she was just going through the motions. The strain between them was obvious!"

Beyonce reportedly sparked cheating rumors when she changed the lyrics of Resentment at the couple's June 28 performance in Cincinnati, Ohio.

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Tags: Beyonce Jay Z Divorce Rumors Beyonce And Jay Z Divorce celebrity couples