LOS ANGELES (Reuters) - Actor Christian Slater was sentenced to three months in prison on Tuesday for assaulting his girlfriend and a police officer and being under the influence of cocaine, becoming the second Hollywood star in two days to be sent to jail. Slater, 27, often referred to in the media as one of Hollywood's "bad boys," pleaded no contest to three charges. Commissioner Judge Joseph Biderman in West Los Angeles Municipal Court also ordered Slater, a co-star in the film "Interview with the Vampire," to spend 90 days in a residential drug and alcohol rehabilitation center and attend a domestic violence program for a year. Slater, who was not in court but was represented by attorney Michael Nasatir, was ordered not to contact or go near Michelle Jonas, the woman he beat with his fists following a late-night party in a West Los Angeles condominium owned by Petra Brando, movie star Marlon Brando's adopted daughter. A similar protective order was issued by Biderman for police officer Julio Flores, whom Slater kicked down a flight of stairs after the officer responded to an emergency call from the condominium. Nasatir told reporters that Slater accepted full responsibility for the incident. "What you saw is Christian Slater taking responsibility for his actions," he said. But in court Nasatir asked the judge not to enforce Slater's 90-day jail sentence because he had already voluntarily spent 118 days in a drug rehabilitation program since the Aug. 11 melee. Deputy City Attorney Susan Schmitter strongly objected and Biderman set a hearing on the matter for Jan 9. Meanwhile Slater was ordered to surrender to begin his sentence on or before Jan 10. Slater, who first appeared as a 17-year-old opposite Sean Connery in "The Name of the Rose," also starred with John Travolta in last year's "Broken Arrow". He has been in trouble with the law before. Eight years ago, he spent 10 days in jail after his second drunk driving conviction -- a charge which came after he crashed his car into a telephone pole. In 1994 he was arrested at New York's JFK airport with an unloaded handgun. He pleaded guilty to a misdemeanor and was ordered to preform community service.