KELLY Clarkson's ex-husband and her former assistant were cohabiting at his $1.7 million ranch home in Montana before his death, The U.S. Sun can report.

Brandon Blackstock tragically died on August 7 at age 48 after a long battle with melanom a, his family confirmed.

The pair had two children during their almost seven-year marriage: daughter River Rose, now 11, and son Remington Alexander, 9, and had been co-parenting before his death.

Brandon's obituary, released on Tuesday, revealed that he was in a relationship with Brittney Marie Jones, who got together with the former music manager after splitting from her husband.

Property records seen by The U.S. Sun reveal they were both residing at a four-bed, two-bath home nestled on more than 40 acres in Butte, Montana .

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