While performing at Planet Hollywood Resort and Casino's Bakkt Theater over the weekend, Clarkson sent a clear message to Blackstock after their messy, two-year divorce that also saw her father-in-law go after her in court.
The "Because of You" songstress covered Gayle's "abcdefu," but when it came time for the chorus, the musician personalized the tune to fit her own situation.
In a now-viral video of her performance, Clarkson sang: "F--- you and your dad and the fact that you got half, and my broken heart, turn that s--- into art. F--- you, and your view from the valley I bought you, everybody but your dogs, you can all f--- off!"
The original lyrics of the chorus go: "F--- you and your mom and your sister and your job. And your broke-a-- car and that s--- you call art. F--- you and your friends that I'll never see again. Everybody but your dog, you can all f--- off."
When addressing the crowd, Clarkson also declared, "Whatever you do, don't throw it at me, people. If you're gonna throw s---, throw diamonds."
Her second warning to her fans was a reference to the recent slew of audience attacks on musicians, with one concertgoer chucking a phone at Bebe Rexha — which resulted in her suffering a black eye — and a drink being thrown in Cardi B's face.
Clarkson famously filed for divorce from Blackstock in 2020, having finalized their split in March 2022 after a nasty two-year custody and property battle. Clarkson has also been battling with Blackstock's dad, Narvel, who owns Starstruck Management Group, which the songstress was signed to for more than 13 years.
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As for how Clarkson and Blackstock's legal battle went down, the former was ordered to pay her ex a massive one-time payment of just over $1.3 million. The A-lister also has to pay Blackstock a monthly child support payment of $45,601 for their two children, in addition to paying him $115,000 in spousal support per month until Jan. 31, 2024.