DMX's Newest Mug Shot The Dirty Dozen!

TMZ has obtained DMX's newest mug shot -- taken in Arizona for a probation violation earlier this month ... which racks up his grand total of mug shots to ............ TWELVE!!!!!!!!

DMX Mugshot
As we previously reported, X -- aka Earl Simmons - was busted for failing to check in with his probation officer.

According to the Arizona Department of Corrections, DMX is currently housed in the mental health unit of a corrections facility in Phoenix.