Whitney Houston, who reigned as pop music's queen until her majestic voice and regal image were ravaged by drug use, erratic behavior and a tumultuous marriage to singer Bobby Brown, has

The 18-year-old was "her mom's caretaker and biggest cheerleader," a source tells Us.

Members of the audience applaud as singer Whitney Houston, who died Saturday, is shown on a video screen in a 1994 Grammy performance during the 54th annual Grammy Awards in Los Angeles, Calif., Feb. 12. Musicians Rihanna, Katy Perry, Bruno Mars and

Whitney Houston's career highs and lows were often reflected in her interviews with the press. Houston, who died on Saturday at the age of 48, provided the media world with a range of interview appearances.

Music superstar Whitney Houston has died at the age of 48.