Brittney worked as an assistant to both Brandon and Kelly during their marriage. Learn more about Brandon's girlfriend here.

The full statement read: "Unfortunately, Kelly Clarkson will be unable to appear at Band Together Texas as planned, due to personal circumstances. We send out love to Kelly and her family." Clarkson was slated to appear at the event at the Moody Center in Austin to help raise funds for the Community Foundation of Texas Hill Country and the Central Texas Community Foundation in support of Texans who were affected by July's deadly flooding.

Kelly Clarkson canceled her appearance at the Band Together Texas Benefit following the death of her ex-husband Brandon Blackstock. She and the late music manager share daughter River and son Remington.