Rick Ross is on "a form of life support,"TMZ reports. Sources have told the site that the rapper's heart and lung functions are being controlled by a machine in the cardio unit of a Miami area hospital – TMZ writesthis "a strong sign he might have suffered a heart attack."Earlier Friday, it was reported that he had been hospitalized in Miami with whatTMZreported was likely pneumonia. He reportedly entered the hospital after someone from his home called 911 around 3:30AM on Thursday morning. Ross has a history of seizures, which were apparently noted in the emergency call.A rep cancelling a Thursday night appearance confirmed that Ross was in the hospital, but a family member denied his hospitalization to TMZ on Friday morning.