When did the Dutch rapper of Moroccan descent who returned as a coach in The Voice of Holland born? 
The Voice of Holland (season 5):  Marco Borsato, Trijntje Oosterhuis, Ilse DeLange and Ali B returned as coaches. Ali B: Ali Bouali, stage name Ali B (born 16 October 1981), is a Dutch rapper of Moroccan descent.
16 October 1981