Woman Hospitalized at Chris Brown's 30th Birthday Party for Possible Overdose

Chris Brown's birthday party didn't end well for everyone who attended, because one woman was rushed to the hospital over a possible drug overdose.

Brown's 30th birthday bash went down Sunday night at Sky High Sports in Woodland Hills, CA. Sky High Sports is a trampoline center, and it was closed down to the public for the private party.

Law enforcement sources tell us, the L.A. City Fire Department got a call at 11:56 PM for a possible overdose. One woman was transported by ambulance to a local hospital, and her status is currently unclear.

LAPD also rolled to the scene of Brown's party to investigate the circumstances of the incident, and the party appeared to clear out when the police arrived.

Brown was seen leaving the party in a Rolls Royce after the ambulance arrived and took the party guest to the hospital.

Celebrities in attendance were Nelly and O.T. Genasis ... however his loyal defender,Justin Bieber, did not show up to jump around.