EXCLUSIVERobert Downey Jr.'s son Indio won't have his day in court just yet ... TMZ has learned his arraignment scheduled for Thursday was pushed back because the 20-year-old is still getting treatment in rehab.
As TMZ first reported, Indio was arrested in West Hollywood back on June 29 after cops observed him smoking something out of a pipe while riding in the passenger seat of a car.
Indio is facing charges of felony possession of a controlled substance and misdemeanor possession of drug paraphernalia.
Thursday in court, his attorney, Blair Berk, told the judge Indio is doing well in his live-in treatment facility.
He's due back in court next month.