The pop music’s queen Whitney Houston died at 48. Her publicist Kristen Foster said the cause of death is unknown.

According to a source, Whitney’s on and off beau Ray J found her dead body in a room at the Beverly Hilton hotel. Whitney was expected to attend Clive Davis’ annual pre-Grammy party at the Beverly Hilton.

She had struggled with drug addiction problems and a tumultuous marriage to singer Bobby Brown, with whom she has a daughter, Bobbi Kristina, 19. The couple divorced in 2007.

The legendary pop singer, who was one of the world’s best-selling artists from the middle 1980s to the late 1990s, sold more than 170 million albums, singles and videos. Among her best hits were "Saving All My Love for You," "How Will I Know," ''You Give Good Love" and "The Greatest Love of All."

Houston recently starred in a film with Jordin Sparks that is due to arrive in theaters Aug. 10.