Küster appeared as a dancer in the music video “Türlich Türlich”, from the German rap-project Das Bo. She became famous while as the girlfriend of Dieter Bohlen. They have a son, Maurice Cassian. She was a guest on well known German TV-shows like Wetten, dass..? and the Johannes B. Kerner-Show. In summer 2006, she left Bohlen and is now living in Hamburg.She presented the Sat.1 show You Can Dance!, starting in November 2006.