The accident happened around 6 p.m. at the bridge connecting Miami Beach’s exclusive Palm Island to the MacArthur Causeway.
City of Miami Fire Rescue crews responded to the scene and rushed the singer and one other person to the hospital.
A law-enforcement official, speaking on condition of anonymity, confirms that Sean Kingston, 21, was thrown from his jet ski after crashing into a bridge.
Family and friends gathered at the hospital immediately after the accident.
The cause of the crash was under investigation Sunday night.