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Her style was and seems to be chic, casual, and simple - particularly in this black spaghetti strap dress that stands as the trademark look of her touring days

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Clarkson opened the show in black and white lighting with a rousing Kellyoke performance of Madonna's Dick Tracy ballad, "Sooner or Later." Aside from Clarkson's elegant costume, she flipped her daytime talk show into a 1940s-inspired "black and white film noir mystery." Clarkson took to Instagram to share some of the behind-the-scenes magic of how they transformed the Clarkson Show studio into a Halloween whodunnit, flexing her eye-catching costume throughout