Hadiza Blell, now Hadiza Blell-Olo, better known by her stage name Di'Ja, is a Nigerian singer. She is currently signed to Mavin Records. In 2009, she released her first single "Rock Steady", which was nominated for Best Urban/R&B Single at the 2009 Canadian Radio Music Awards. Di'Ja has lived in Nigeria, Sierra Leone, the United States and Canada. Her mother, Asma'u Blell is from Northern Nigeria and her father, Amb Joseph Blell is from Sierra Leone.