Usher's stepson is reportedly in a critical condition after a Jet Ski accident.

Kyle Glover, 11, is in an Atlanta hospital after being struck by a 38-year-old man on a Jet Ski at Lake Lanier, reports TMZ. Kyle is Usher's ex-wife Tameka Foster's son.

He is believed to have been sitting on an inner tube towed by a speedboat when the accident happened on Saturday.

Kyle was reportedly unresponsive when he was rescued from the water and TMZ claim he remains in the same condition.

The boy was sitting on the inner tube with a 15-year-old girl, who was also taken to hospital.

Georgia Department of Natural Resources officials are investigating the incident.

Despite Usher's bitter split from Tameka, the singer chartered a plane for her to be by her son's side. Tameka who was out of town at the time - was reportedly "extremely thankful" for the kind gesture.

Tameka split from Usher in 2009 and the pair are currently embroiled in a bitter custody battle over their two young sons.

Stars have been taking to Twitter to show their support following the accident.

"Praying that Usher and Tameka's son is OK" music mogul Russell Simmons wrote.