Cape Town - In a track titled Not Alike on Eminem's surprise album, Kamikaze the rapper name-checked Machine Gun Kelly.
Following that song, MGK responded with a song titled Rap Devil, which was released last week and references his nemesis’ popular track titled Rap God.
When Kelly performed the diss track last weekend he told the audience: "this is a battle between the past and the future".
The performance took place in Grand Rapids, Michigan. Eminem is from Detroit, Michigan.
WATCH A VIDEO OF THAT MOMENT HERE: