CHI has hired its  first ever celebrity ambassador—actress, singer and pop-star Zendaya, who is known for her constantly evolving look.   CHI is collaborating with Zendaya to bring to life the brand's expansive hair care, styling and tool collection. The alliance will include number of initiatives including an ad and marketing campaign inspired by her trend-setting looks, social media integrations, and in-store and red carpet events.   “Zendaya is youthful, edgy and energetic. Her dyn...