Friends first publicly raised concern on Monday, when a fellow model tweeted that Ataui hadn't been seen in two weeks. Celebrities including Rihanna rallied to raise awareness and find Ataui, who modeled for her River Island collection.'If any one has any information on this young lady’s whereabouts, please call the NYPD or email [email protected]/* */,' Rihanna tweeted. No details on Ataui's condition at the hospital have been released yet.Ataui, who came to the United States as a refugee from Sudan, was last seen near The Attic Lounge, a rooftop hotspot on West 48th Street near Times Square around 11 pm on August 6, cops say.But her model agency says she was with her boyfriend, Grant Monohon, 30, two days later than that.Ataui split with her husband, fellow Trump model Kortney Hopkin, known as Kortney William, 18 months ago. They are in the process of divorcing.She has appeared on the pages of Marie Claire France, Vogue Germany and Rihanna's Spring 2013 River Island collection.Ataui has also strutted on the catwalk for designers including Zac Posen and Proenza Schouler.As an 18-year-old pictures of her stumbling and falling to her knees during a New York Fashion Week runway show for Z by Zac Posen went viral. (dailymail.co.uk)Bakudaily.Az