Kelly Clarkson seems to have taken a shot at her ex-husband Brandon Blackstock and his father, Narvel Blackstock, who Clarkson is in a heated legal battle with. On Thursday (March 30), Clarkson took her frustration over the Blackstocks’ to the stage of her daytime talk show to perform a cover of GAYLE’S “ABCDEFU.” Kelly’s not-so-subtle…
