BET Awards: Rihanna calls Mary J. Blige 'queen of hip-hop'

The 19th BET Awards were opened by rapper Cardi B and Offset with their explosive performances on Sunday. American singer Mary J. Blige was honoured with Lifetime Achievement Award by Rihanna. She called her the 'queen of hip-hop and R&B' praising her for being the first person to compete for both acting and songwriting award in the same year.