Nicole Kidman marked the start of the week on a somber note as she paid a heartfelt tribute upon learning of a devastating loss.MORE: Nicole Kidman showcases natural curls in never-before-seen childhood photosThe actress mourned the sudden and tragic demise of fashion designer Virgil Abloh, who lost his life to a battle with cancer on Sunday.She shared a picture of the popular fashion designer to her Instagram Stories as she penned a tribute to him.WATCH: Nicole Kidman wows with incredible