Rhythm and blues singer Sean Kingston and a female passenger were hospitalized Sunday after King's watercraft crashed into a bridge in Miami.
Florida Fish and Wildlife Commission spokesman Jorge Pino said Kingston, 21, and his companion were ejected from the Jet Ski when the watercraft hit the bridge at 6 p.m.
Authorities in Miami said there was no indication that drugs or alcohol had played a part in the accident.
Kingston is best known for his 2007 hit "Beautiful Girls," and most recently collaborated with Justin Bieber on "Eenie Meeni."
"In my prayers tonight. A true friend and big bro. Please keep him in your prayers tonight as well," said Bieber on his Twitter account.
Epic Records Spokeswoman Lauren Ceradini told CNN Monday that Kingston's had been "stabilized."