Rapper 50 Cent attacked a co-star on the set of his new movie RIGHTEOUS KILL, according to reports The hip-hop star - real name Curtis Jackson - allegedly got into a "heated argument" with actor Frank John Hughes after he confronted Jackson about not knowing his lines. And the altercation was so fierce, production staff called for paramedic's assistance. A source tells MediaTakeOut.com, "Frank tried to correct (50 Cent) and he got really upset... Before it was all over (50 Cent) had Frank on the ground pummeling him. "The paramedics looked at Frank and he's OK. It's everyone else here that's still shaken up... No one is trying to get on (50 Cent's) bad side."