Kelly Clarkson kicked off her Las Vegas residency with a message to her ex-husband, Brandon Blackstock. She performed a cover of the song "ABCDEFU," changing the lyrics to send a direct message to Blackstock. Clarkson referenced their ugly divorce and smiled as if to say she won that battle. The residency runs through August 19 and includes some of Clarkson's classic songs and new ones from her break-up album. Clarkson recently purchased a new mansion in California after selling her estate in Nashville.