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As they say, Karma is a bitch.

from www.tmz.com – Porn stud Mr. Marcus — who, we kid you not, is a member of the porn Hall of Fame — was arrested in Hollywood early this morning, after cops say he was driving drunk … TMZ has learned.

Law enforcement tells us … Mr. Marcus — star of “Phat Ass White Booty 6” and “Manhammer 7” — was pulled over in a Hyundai Elantra around 2:30 AM after cops noticed the car weaving all over the road.

During the stop, we’re told cops smelled booze, so they performed a field sobriety test.

Sources tell us … Marcus bombed the breathalyzer (blowing isn’t really his forte) … so he was arrested for DUI.

Marcus — who was the source of the famous porn star syphilis scare of 2012 — is still in custody.