Rick Ross is unconscious and paramedics are desperately trying to resuscitate him.

Rick was on a flight going from Ft. Lauderdale to Memphis today, when the rapper lost consciousness. The plane was forced to make an emergency landing.

Emergency workers tell us the call came in at 12:55 PM ET ... the caller reported a seizure.

Ross is currently on a gurney at the airport. Members of Rick's entourage are standing by, some of them extremely emotionally upset.

4:54 PM PST: Rick Ross just suffered another seizure on his private jet -- his second in one day.

11:54 AM PST: Rick Ross -- who's still in the hospital -- is telling people he still plans to perform tonight in Memphis at FedExForum.



11:05 AM PST: It appears Rick Ross is now tweeting, claiming he is okay.

10:57 AM PST: Ross was transported to a nearby hospital.

A family member tells TMZ, Rick is currently under close supervision and is doing fine. We're told drugs and alcohol were not involved.

10:50 AM PST: Rapper Wale -- one of Rick's closest friends -- just tweeted, "I just talked to Ross...he's 100 pct ok.." Another member of Rick's entourage DJ Sam Sneaker also says the rapper is okay.

10:36 AM PST: A witness tells TMZ, Rick fell unconscious right after take-off.

We're told his entourage jumped out of their seats to alert plane personnel -- at which point a doctor on board administered CPR on the rapper.