'Gigolos' Star Jimmy Clabots -- Arrested for Beating Up Girlfriend

One of the stars of Showtime's reality program "Gigolos" -- about real-life male escorts in Vegas -- was arrested early Friday morning for felony domestic violence ... TMZ has learned.

Law enforcement sources tell TMZ, 31-year-old Jimmy Clabots -- who also starred in the movie "Another Gay Sequel: Gays Gone Wild!" -- had gotten into a verbal altercation with his girlfriend ... and it quickly got physical.

Cops were called -- and when they arrived on the scene, we're told police observed visible signs of injury on Jimmy's girlfriend.

Jimmy was arrested on the spot. He is currently in custody on $50,000 bail.