Katie Holmes is showing her sultry side.The 42-year-old actress showed some skin in a black dress with cut-outs while attending the Vacheron Constantin Flagship grand opening in New York City on Thursday. However, Holmes gave the risque New York Fashion Week look a comfy touch as she wore an open black button-up shirt and white tennis shoes for the event.The former star kept her beauty look light, wearing her dark wavy locks in a half-up-half-down style.