The `Beautiful Girls` hitmaker struck a bridge connecting Palm Island with the MacArthur Causeway in Miami, Florida, on Sunday evening (29.05.11) and has been taken to the Jackson Memorial Hospital nearby to be treated for his injuries.
A representative for the 21-year-old singer said: "SeanKingston was in an accident today. No further details are available at the moment. He and his family thank everyone for the well-wishes."
A female passenger who was also on the jet-ski has also been taken to hospital.
Officials investigating the accident are said to have ruled out alcohol playing a part in the accident, TMZ reports.
Fellow musician Nicki Minaj has tweeted her support for the singer, saying: "My love & prayers are with SeanKingston & his family.(sic)"
Justin Bieber - who collaborated with Sean on the song `Eenie Meenie` - asked his twitter followers to pray for him.
He wrote: "got my friend @seankingston in my prayers tonight. a true friend and big bro. please keep him in your prayers tonight as well.(sic)"