Make-up artist to the stars, Paul Starr, was found dead Tuesday in his Los Angeles apartment, Women's Wear Daily reports. The cause of death is unknown. Starr's body was discovered after knocks at his residence went unanswered, and authorities reportedly broke the door down. A friend tells the daily that the make-up artist had been out of sight for several days.

According to his web site, Starr has worked with celebs Madonna, Britney Spears and Gwen Stefani.

Starr, a twenty-year veteran make-up artist, authored Paul Starr on Beauty: Conversations with Thirty Celebrated Women.