A Hollywood socialite who dated Kevin Costner for three years and partied with Robert De Niro and Jack Nicholson kicked a police officer in the leg while she drunk destroyed her own house.

A former Hollywood socialite who dated star Kevin Costner went berserk and kicked a policewoman as they tried to stop him from drunkenly destroying his house.

San Francisco-born Birgit Cunningham, 60, who dated Costner for three years, went on a rampage in her London apartment shouting “b*******” at police officers.

Ms Cunningham, who claimed to have had an affair with Lord Strathclyde, a married Tory peer, had once been dean of the champagne-drinking Hollywood Brit Pack.

His old man The Sunset Strip residence – owned by film producer Julia Verdin – had been nicknamed “Party Central” and its regular guests included Robert De Niro; John Hurt and Jack Nicholson.

But yesterday she found herself a world away home she once shared with actress Elizabeth Hurley, as she was transported to the imposing walls of Westminster Magistrates Court.

Ms Cunningham dated Hollywood actor Kevin Costner for three years (pictured: the couple together in Los Angeles)

Ms Cunningham pictured in France in 2000. She pleaded guilty to assaulting PC Alin Garbuja after police were called to her drunkenly destroying her house.

On Tuesday, Ms Cunningham pleaded guilty to one count of assaulting PC Alin Garbuja on July 11 this year after the drunken brawl at his council flat.

She was conditionally discharged for eighteen months and ordered to pay the police officer compensation of £150.

Prosecutor Alza Rashed told the court that police officers were present at his speech in the Royal Borough of Kensington and Chelsea at around 9.30pm.

“Police were called by neighbors following reports that this defendant had broken items in her property.

“They said she was upset because she had just had her cat put down on the advice of her vet.

“Police officers noticed that she was visibly drunk at the time and repeatedly called them ‘b*******’ as she presented herself to PC Garbuja, who asked her to turn away .

“The officer described the defendant as being “aggressive” and “in her face,” and kicked her in the leg before she was immediately handcuffed.

“It was a kick of considerable force for the police officer and she also tried to punch him during the fight,” explained the prosecutor.

“The officer stated that she had scratches on her right hand and that she winced in pain when he touched his body.”

In his victim impact statement, PC Alin Garbuja said: “As a police officer I expect negative behavior but being kicked crossed the line as I was trying to help the individual .”

Cunningham now lives in the flats, located in west London, where police were called.

In 2006, former ‘It girl’ Ms Cunningham walked free from court after admitting to kneeing her ex-lover in the groin during a courtroom scuffle.

Cunningham’s lawyer, Stuart McDonald, told the court that health and medication issues contributed to the incident.

“She suffers from chronic back problems, degenerative disc disease and her GP was trying to change her medication regime and the medication she was dependent on, almost to the point of addiction, was taken away.”

“She has had a long-standing alcohol addiction problem and, in her youth, lived what could be described as a glamorous and exciting lifestyle and turned to alcohol for relief.”

Meanwhile, magistrates did not accept the police account of the assault and agreed that a pre-sentence report from the probation service was not necessary.

“We do not agree that this was a significant force or over a prolonged period of time,” announced the president of the tribunal, Jeffrey Manton.

Cunningham, who was privately educated and attended the exclusive £13,000-a-year Roedean Girls’ School, is the daughter of a former Bank of America treasurer.

She grew up in a sprawling country house in Leatherhead, Surrey, and spent her summer holidays in luxury rented properties in the south of France.

In 2000, Ms Cunningham was a rural campaigner and appeared covered in fake blood and handcuffed to the gates at the bottom of Downing Street.

The clothes were bought at Harrods and Cunningham has previously spoken of being driven to parties in a Bentley and living in a £1million Chelsea flat bought by her wealthy father.

She studied fine arts at Rutgers College in New Jersey, worked in a Paris gallery, and was later employed as a sales assistant to the vice president of Universal Pictures.

Drinking problems ended Cunnigham’s Hollywood adventure and she returned to London, immersing herself in green issues and giving birth to her son Jack, 23, in 2000 following a relationship with racing driver Old Etonian Sir Harry Nuttall.

She then became a single mother activist by suing Sir Harry for child support, resulting in an arrest for assault during a courtroom brawl.

Mr McDonald added: “She is refusing the structured treatment of a court requirement for alcohol treatment because she is doing it herself.

“I do not wish to minimize what the officer said, but this offense has all the hallmarks of lesser culpability.

“The officer stated, ‘At one point she kicked me in what I believe was my leg.’ This was minor or no force.

The attorney asked for leniency based on: “Her age, her remorse during the interview and whether she addressed the underlying cause of this.” She receives state benefits.

Cunnigham’s last criminal conviction was in 2013, but no details were given.

“You pleaded guilty, which drops the case and we have noted your criminal record and you are of pretty good character,” Mr Manton told Cunningham, who appeared in court with a cane .

“We are going outside the guidelines because you are already seeking help and should continue with Alcoholics Anonymous and their twelve-step program.

“There’s no point signing up for an alcoholism program since you’re already doing it yourself.

“If you don’t make these payments, the debt collector will show up at your door. In the nicest way possible, we hope to never see your face again.