Shocking news spread around the world Saturday that superstar singer Whitney Houston had died at the Beverly Hilton Hotel that afternoon. Fans were stunned at the sudden passing of such a renowned talent, though her life had been riddled with addiction for the past decade.

TMZ reported Sunday morning that the singer was found face-down in the hotel bathtub. According to sources, her stylist, hairdresser and bodyguard were in the room at the time and became concerned after they realized Houston had been in the bathroom for more than an hour.

They knocked on the door and, after no answer, the hairdresser went in to check on the singer. The woman screamed and one of the bodyguards ran in and pulled Whitney Houston from the tub.

Whitney Houston was found with her face down in the water. Her legs were up, as if she had slid down the back of the tub, according to TMZ.

Sources told TMZ that Houston's body was very cold when it was discovered. She was pronounced dead at 3:55 p.m. after paramedics were called to the scene.

Family members told TMZ that the singer had been using Xanax, a prescription drug commonly used for anxiety and depression. Apparently on Friday night, the singer had been partying a lot - drinking and mixing the alcohol with Xanax. TMZ notes that this combination could cause someone to fall asleep in a bathtub.

Though no cause of death has yet been confirmed, Houston's luxury suite at the Beverly Hilton was littered with bottles of prescription pills, according to The Daily Mail.

On the Thursday evening before her death, the singer was spotted out in Hollywood where she reportedly got into a fight with an X Factor finalist and partied heavily, drank and chatted loudly with friends at the hotel bar, according to TMZ.

The Los Angeles County Coroner could perform an autopsy as early as Sunday to determine the exact cause of death. No illicit drugs have been found.

After the announcement of her death, many thought of her personal demons. Whitney Houston's struggle with drug and alcohol use was highly publicized. The biggest devil is me. I'm either my best friend or my worst enemy, Houston told ABC's Diane Sawyer in a 2002 interview with then-husband Bobby Brown by her side.

Houston had declared herself drug free to Oprah Winfrey after having gone to rehab twice. She became headline fodder for her missed concert dates, strange appearances, a stop at an airport due to drugs and very public meltdowns.

Whitney Houston leaves behind her daughter, Bobbi Kristina, 19.