Actor Robert Downey Jr. was arrested on a new drugs allegation only hours after he was charged with another one after he sneaked into a neighbor’s Malibu home and passed out in a bedroom, only to be discovered by a horrified homeowner, officials said Wednesday.

After spending the night in a hospital detention unit, he was freed today.

Downey, 31, rode away from the Los Angeles County-USC Medical Center with a white pillowcase over his head and a new black sport utility vehicle, making an obscene gesture to television crews as he passed.

After the property owner reported to police, the actor was arrested late Tuesday on accusations of trespassing and being under the influence of a controlled narcotic, which officials thought to be heroin.

According to Los Angeles County Sheriff’s Sgt. Gabe Ramirez, when deputies arrived, the occupants informed them they had returned home to discover a guy passed out on a bed in their home.

Downey, whose house is approximately a block away, was identified by the deputies, and he was taken to Santa Monica Hospital, where he was revived. Later, he was transported to a Los Angeles prison unit.

The Oscar nominee’s troubles sounded the alarm in Hollywood. Agents in the area expressed concern that the arrests might jeopardize his career.

Downey was arrested just hours after being charged with drunken driving and possession of a hidden firearm in a previous incident.

On July 26, he was scheduled to be arraigned on those counts. Downey was arrested after officers allegedly discovered small amounts of crack, powder cocaine, and tar heroin in his vehicle, as well as a concealed, unloaded .357-caliber Magnum.

Downey’s most recent misadventure looked to be the result of a mistake.

On August 30, he will be arraigned at Malibu Municipal Court.

Downey has appeared in a variety of films, including “Chaplin,” “Less Than Zero,” “Natural Born Killers,” “Short Cuts,” and “Back to School.” He is the son of filmmaker Robert Downey.

Emilio Estevez, Mel Gibson, Dustin Hoffman, Jack Lemmon, Frank Sinatra, Steven Spielberg, Sylvester Stallone, and Eddie Van Halen are among the celebs who reside in a seaside community alongside Downey, who was nominated for an Oscar for the film “Chaplin.”