Rick Ross -- Suffers Another Seizure on Private Jet

TMZ has learned ... Rick Ross' private jet made an emergency landing in Birmingham, Alabama, 2 hours ago, en route to his concert in Memphis ... and we found out he suffered another seizure.

It's the second time today where a plane in which the rapper was a passenger made an emergency landing. We broke the story ... Rick suffered a seizure this morning on a Delta flight that returned to the Ft. Lauderdale airport.

Rick went to the hospital, was released, and then took off at 5:07 PM ET from Ft. Lauderdale to make his concert tonight in Memphis. But at 5:44 PM CDT, the plane was diverted and landed in Birmingham after Rick had a seizure on board.

Rick is currently in a Birmingham hospital emergency room. We do not know his condition.

Before Rick took off from Ft. Lauderdale, he tweeted a video showing he was ok.

Rick was supposed to be on stage in Memphis at 7:30 PM ET.

5:05 PM PST: Sources tell TMZ, rapper Yo Gotti -- who was originally supposed to perform with Rick Ross in Memphis tonight -- has now been asked to perform solo. So far, Gotti hasn't decided.