"Terminator 3: Rise of the Machines" star Nick Stahl has been arrested on suspicion of lewd conduct in Los Angeles, according to reports.

The troubled actor was taken into custody on Thursday after undercover vice officers allegedly caught him committing a "lewd act" while watching a pornographic movie in a private booth at an adult store in Hollywood.

He was booked on a lewd conduct charge and released on bail, according to TMZ.

Stahl is said to have told a cameraman for the website his arrest was a "misunderstanding" as he exited the police station.

The 33 year old has battled a series of personal problems this year - he disappeared multiple times and also checked into a rehabilitation clinic to receive treatment for substance abuse.