¿Como se dice salir del clóset?

Salir del closet

Salir del armario

To come out of the closet - It means when someone tells their friends, family and everybody that he's a gay.

Example:

Ricky Martin finally came out of the closet, he told the media that he's gay. - Ricky Martin finalmente salió del clóset / armario, el le dijo a los medios que es gay.