Blackstock, a former talent manager, died Aug. 7 at 48 following a three-year battle with cancer. Clarkson kept the family matter private, but a resurfaced clip from the July 26 show of the Grammy winner's now-postponed Las Vegas residency appears to allude to the tolls of the diagnosis.

Kelly Clarkson was moved to tears on stage in one of her final performances before the death of her ex-husband, Brandon Blackstock. In an emotional video from the July 26 show of her Las Vegas residency,

After wiping the tears from her face, the “American Idol” alum cracked a joke to her fans about the magic of “compartmentalization.”