Kelly Clarkson’s top priority is her kids after her ex-husband Brandon Blackstock’s death.

The “Since U Been Gone” singer, 43, has “been devastated” for her daughter, River, 11, and son Remington, 9, whom she shared with Blackstock, ever since their father was diagnosed with cancer over three years ago.

The talent manager died on Thursday, August 7 , at age 48, following a yearslong private battle with melanoma, a serious form of skin cancer. 14

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“When she found out that he was sick, she remained protective of him for their sake,” a source told People after Blackstock’s passing.

“Kelly has always tried to keep things classy. It became clear earlier this year that Brandon was not doing well. She’s been devastated for the kids,” they added.

Clarkson married Blackstock in 201

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