Keith Urban struggling after Nicole Kidman divorce

Keith Urban is reportedly facing tough times following his split from Nicole Kidman.

Insiders recently told Radar Online that the country superstar is nearing a breaking point after his divorce from Nicole.

Keith recently left fans stunned when he toppled backward after a fan told him her name was "Nicole" at Bridgestone Arena.

A source stated, "Keith is running on empty. He's acting like a lost soul, and there's a lot of concern that he's in emotional free fall without Nicole by his side."

"This was obviously Keith's way of making light about his current situation. But the painful and undeniable truth is that he's extremely fragile, and a lot of folks are worried about him," they added.

As per the sources, Keith is more alone than ever. "Keith has given everything he has to becoming a better musician, and right now it looks like that's wrecked his personal life."

"Even in their happiest years, Keith's loner streak and introversion tested Nicole's patience. Now that they've called it quits, Keith is more alone than ever," the source said.

However, Keith Urban is going to go "alone" in the next chapter of his life, and "he's going to do it far away from Los Angeles, just how he likes it."

Nicole Kidman filed for divorce from the father of two on September 30, citing irreconcilable differences.