Celebrity Makeup Artist Dead After Apparent Suicide

The celebrity makeup artist who made a name for himself working with Katy Perry, Selena Gomez and Mariah Carey ... is dead after an apparent suicide in L.A.

Law enforcement sources tell TMZ Jake Bailey's assistant found him Friday morning in his home and called the cops. We're told it appears he succumbed to carbon monoxide.

The 37-year-old was most famous for his work with Perry ... most notably, her Cosmo cover.

We're told an autopsy will be completed by the L.A. County Coroner's Office.