Kelly Clarkson's ex husband and father of her two children, Brandon Blackstock, has died, and the family's loss makes their last Instagram posts even sadder.

Clarkson had announced late Wednesday night that she was postponing the August dates of her Vegas residency because Blackstock "had been ill."

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.