Kelly Clarkson is said to be "devastated" for her kids after the death of ex-husband Brandon Blackstock , RadarOnline.com can report.

Despite their messy divorce, the singer has singled out caring for her children as the main reason she felt it necessary to cancel her Las Vegas residency . Article continues below advertisement

Clarkson's divorce from Blackstock has never affected her devotion to her kids, River, 11, and Remington, 9, and she had been privately supporting him during his secret three-year battle with skin cancer.

A source close to the 43-year-old told People : "When she found out that he was sick, she remained protective of him for their sake.

"Kelly has always tried to keep things classy. It became clear earlier this year that Brandon was not doing w

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