Josh Hartnett crashed a private party at the Chateau Marmont last Friday night.

The ‘30 Days of Night’ actor was hospitalized with stomach problems for much of the past week–but that didn’t stop Josh and four friends from embarking on their mission after they heard about a bash in another room of the hotel where they were partying.

A spywitness tells FOX News: “They turned up at the room and were told that they weren’t welcome but somehow Josh got in and left all of his friends standing outside on the doorstep. He made his way into the kitchen and poured himself a teacup full of vodka.”

Sienna Miller dashed from Miami to Los Angeles to visit Josh Hartnett after hearing the actor had been hospitalised with gastrointestinal problems, sparking speculation they two have been quietly dating.

Sienna was most recently romantically linked to married Brothers and Sisters star Balthazar Getty.

A source told X17Online: “Sienna had just 24 hours to fly all the way to Los Angeles to see Josh. She was very concerned and wanted to be sure he knew how much she cared for him.”

Josh was rushed to Cedars-Sinai Medical Center on Sunday after complaining of “excruciating” abdominal pain. The 30-year-old actor had reportedly been experiencing such discomfort for months.

According to The LA City Fire Department, a call came in at 12:53 AM on Monday from the Chateau Marmont Hotel in West Hollywood for someone complaining of abdominal pains. The 30-year-old actor was taken to the hospital around 1:30 a.m. Monday morning with severe stomach pain and kept briefly for observation of a gastrointestinal disorder, his publicist says.

The condition is the same one the actor suffered from while performing in the play Rain Man in London last November; he was sidelined for several days.

“We do not have a Josh Hartnett currently staying with us. Because of patient confidentiality I am not prepared to confirm if he was treated here or not,” a Cedars-Sinai ER nurse told RadarOnline on Monday.

“They definitely looked like a couple,” says one onlooker. “At one point, they were holding hands across the table, but they quickly hid them underneath. They looked really cozy as they dined, gazing into each other’s eyes, smiling and laughing.”

The actor vehemently denies that he was secretly taped having lewd public sex with an unidentified woman while staying at London’s SoHo Hotel last month. Josh, 30, has even filed suit against Britan’s Daily Mirror for publishing the allegedly bogus tidbit. Nevertheless, at least one adult video distributor is offering big bucks for access to the video.

David Joseph, CEO of Red Light District, the studio that brought us gutterbutt gems like Tinker With My Stinker and Cum Fart Cocktails, is ready to cut a $500,000 check to anyone who serves up the steamy footage.

The 30 Days of Night actor is in the UK starring in the West End theater production of Rain Man.

Josh, 30, was unaware he was being watched by hotel staff as he had sex with a mystery woman in front of hidden surveillance cameras.

“Josh and the girl were getting pretty hot and heavy,” a spy tells Britain’s Daily Mirror.

“Josh didn’t seem bothered that the library wasn’t locked and anyone could just burst in. He just kind of went for it.”

Josh has been “asked to take his personal business elsewhere” in the future.

“He has been very well behaved since,” a member of the hotel staff adds.

Josh Harnett will make a splash on the British stage this September when he stars as “Charlie Babbit” in the West End production of Rainman. Here’s a video from the actor’s Thursday morning appearance on Live with Regis & Kelly.

Josh Hartnett is set to star in the West End production of Rainman, based on the 1988 film of the same name. The movie, which starred Dustin Hoffman, snagged an Academy Award for Best Picture.

The twenty-nine year old Hartnett stars as self-centred car dealer Charlie Babbitt, a role first made famous Tom Cruise in the original fim.

“It has always been my intent to work on the London stage. It was only when I read the complex and charismatic character of Charlie Babbitt that I knew the time was right.”

Rainman will run from September 8th to December 20th at the Apollo Theatre in London.

Just days after being romantically linked to Rumer Willis, Josh Hartnett was reportedly spied swapping numbers with Lindsay Lohan at New York City nightspot.

The twenty-one year old starlet sent twenty-nine year old Josh a drink while the two partied with friends at New York’s Beatrice Inn on January 31st.

“They’d never met before and Lindsay thinks she’s hot, so she just went for it,” an In Touch Weekly spy says.

“Lindsay definitely wanted him to notice her, but he didn’t say anything for a while. It wasn’t until she was leaving that Lindsay went up to Josh and then exchanged numbers and chatted for a moment with him.”

Celebuspawn Rumer Willis is being romantically linked to actor Josh Hartnett.

The pair were recently spotted getting quite cozy at the upscale Beatrice Inn in New York, according to National Enquirer spies.

“Josh and Rumer were hanging out all night,” a Beatrice Inn spywitness snitches to the tab. “They seemed to be getting pretty cozy.”

Rumer is the eldest daughter of actor Bruce Willis and actress Demi Moore. A Hollywood ladies’ man, Josh has reportedly dated singer Rihanna and rehabbing star Kirsten Dunst.