Whitney's mother, Cissy Houston, spoke with her daughter 25-30 minutes before she died and nothing seemed unusual ... sources disclosed. We're told they talked about attending the Clive Davis pre-Grammy party.
Dionne Warwick, Whitney's cousin, called as well ... several hours before Whitney died ... to make sure they were sitting at the same table at Clive's party. And again ... there were no signs of trouble.
The people in touch with Dionne say she is inconsolable adding, "She is an absolute mess."
As for Cissy, we're told she is "hysterical."
Whitney Houston died this afternoon ... a rep for the singer announced. She was 48.
Our sources tell us a member of Whitney's entourage found her in her 4th-floor room at the Beverly Hilton hotel ... and called hotel security -- who then dialed 911. When paramedics arrived Houston was found unresponsive.
We're told police arrived to the scene within minutes and fire was already there on an unrelated call. According to our sources, paramedics performed CPR but it did not work and she was pronounced dead at 3:55 PM.
Our sources say there were no obvious signs of foul play, but BH PD detectives have begun a full investigation. We're told she was ID'ed by family and friends.
L.A. County Coroner Ed Winter told our photog at 7:09 PM that it is too early in the investigation to tell what happened.
Houston was seen out in Hollywood Thursday night for a Grammy party ... and she did not look well (below). She even briefly took the mic and performed a song while she was there -- what would become her last performance.
Sources tell TMZ, Whitney Houston "partied heavily" last night at the Beverly HIlton hotel where she was staying, drinking and chatting loudly with friends in the bar -- but Cissy Houston and Dionne Warwick claim the singer sounded fine just hours before her death.
We're told Bobby Brown is distraught over Whitney's death -- going "in and out of crying fits." His band New Edition tells us, they are "shocked and saddened."
Clive Davis' pre-Grammy party -- which Whitney was supposed to open -- is going on as scheduled this evening, though Clive will not be in attendance.
Law enforcement sources tell TMZ, police are currently seeking a search warrant to investigate the hotel room where Whitney was found dead. One item they'll be looking out for -- drugs.
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