Credit: Kevin Mazur/

Whitney Houston's body was found partially submerged in her hotel room's bathtub on Saturday, multiple sources confirm to Us Weekly.

The "I Wanna Dance With Somebody" singer, 48, was found by a member of her team, who then alerted paramedics. After attempting CPR for about 20 minutes, Houston was pronounced dead at 3:55 p.m.

While early reports suggested that Houston may have accidentally drowned, sources tell TMZ that Houston's true cause of death was a lethal combination of Xanax and other prescription drugs mixed with alcohol.

(Prior to her death, Houston had been frank about her drug and alcohol addictions. In a 2009 interview with Oprah Winfrey -- two years after her divorce from Bobby Brown -- the pop star claimed to finally be sober.)

According to TMZ, coroner's officials told Houston's family there was not enough water in her lungs to lead them to believe she had drowned. Houston may have died before her head became submerged, a source adds.

Houston -- who was discovered in a nightclub by Clive Davis and went on to sell 170 million albums worldwide -- is survived by her daughter Bobbi Kristina, 18, and her mother, Cissy. As of Monday morning, no funeral plans have been announced.