Should Simon Cowell be nervous? TV Guide reports that former “Idol” judge Kara DioGuardi is penning a memoir. “A Helluva High Note: Surviving Life, Love, and American Idol,” is scheduled to be published by a division of  HarperCollins, a rep for the publisher confirmed to TV Guide. DioGuardi served as a judge on the hit show … Continue reading Kara DioGuardi writing her memoir