Big Boi Arrested -- Outkast Rapper Charged with Drug Possession

Big Boi, rapper for the popular group Outkast, was arrested in Miami today on charges of drug possession ... TMZ has learned.

According to the Miami-Dade County Corrections Department, Mr. Boi (real name Antwan Patton) was charged with three counts of possession of a controlled substance and one count of possession of drug paraphernalia.

The controlled substances were listed as ecstasy pills, MDMA powder and Viagra.

According to the Miami-Dade County Corrections Department, all charges are felonies.

Law enforcement sources tell us he was busted by customs and border patrol dogs as he was exiting a cruise ship. We're told Big Boi didn't have a prescription for the Viagra.

He was booked into jail at 1:35 PM ET. He was held on $16,000 bond, but was released this afternoon.

UPDATE: Big Boi's attorney Daniel Kane tells CNN the rapper was traveling with friends when he got busted. Kane says, "A small amount of contraband was found in the collective luggage." He adds, "I am confident when the entire facts are aired Big Boi will be completely exonerated."