© @Copyright HELLO! Hello! Magazine Nicole Kidman has the most beautiful natural curls – although her hair underwent something of a dramatic transformation this week!The Undoing star, 53, took to Instagram to share a snapshot that had been altered by actor and theatre artist, Kevin Zak. MORE: Nicole Kidman's nickname revealed in sweet note from husband Keith UrbanThe photo is a still taken from the hit HBO thriller, which starred Nicole as Grace Fraser and Hugh Grant as her husband, Jonathan.