Sienna Miller flew to Los Angeles from Miami and checked into the Sunset Tower hotel to visit Josh Hartnett as he recovers from his recent health scare, X17online has learned exclusively.

Josh was taken to the hospital in an ambulance earlier this week suffering from what his publicist describes as "gastrointestinal problems."

"Sienna had just 24 hours to fly all the way to LA to see Josh," a friend tells X17online. "She was very concerned and wanted to be sure he knew how much she cared for him."

Looks like Sienna has finally moved on from Balthazar Getty!!!

Oh no! Our favorite Josh (sorry Duhamel) checked into Cedars Sinai Medical Center late last night, complaining of stomach pains. His publicist Susan Patricola confirmed the news and released the following statement to X17online:

"Josh Hartnett walked into an ambulance at approximately 1:45 am this morning suffering from a flare-up of a gastro-intestinal problem that plagued him while he was [staying] in the west end of London during the production of “Rain Man.” He is under observation but is resting comfortably."

X17 photogs on the scene tell us that even though Josh walked onto the ambulance (that's him on the right side of the pic), he looked quite under the weather.

And who is that girl with him? She looks kinda Kirsten Dunst-y...did those two bring their Sundance romance to LA? Or is this a new ladyfriend? Either way, we hope this hottie gets better!

We snapped hunky Josh Hartnett leaving Madeo last night, and even though he's wearing a shiny shirt and funky glasses, we wouldn't kick him off our doorstep!

Everyone and their pet chihuahua (sorry Mickey) attended the pre-Oscar party at Cecconi's in West Hollywood last night, and it seems like the guy to girl ratio was 3:1!

We spotted some of our fav hunks at the event, and we want to know...who's the hottest? Josh Hartnett and his facial fuzz, Jared Leto and his bleach job, sexy Jason Statham, or spicy hot Ricky Martin?

What, you thought you were only getting one awards show this weekend?

Well, the stars would beg to differ - last night, everyone turned out to the Independent Spirit Awards!

Brad Pitt and Angelina Jolie showed up - and Angelina clearly brought the twins!

Javier Bardem didn't win anything for his portrayl of Anton Chigurh - but hey, he's got another shot at some statuary tonight!

The night's big winner was (get ready for a shock) Juno - in addition to Ellen Page's Best Female Lead award, it also picked up statues for Best Screenplay and Best Picture!

We've got more from the Spirits after the jump - check 'em out!

First there's Josh Hartnett roaming the streets of Park City (in some nifty shades, we might add!)...

And then there's Woody Harrelson hitting the Sundance slopes. Hmm, neither of them look really hot, but at least they're both good actors!

Does anyone go to Sundance to see the movies, anyway?

Paris got her groove on at Tao, where she partied with Cisco Adler, Lil' Jon and Jeff Beacher, while X17 photogs caught Josh Hartnett at a party canoodling with a brunette wearing questionable leopard print pants! Jessica Alba tried to keep her baby (and her babydaddy) warm with some hot drinks and Woody Harrelson hit the slopes!

Doncha wish you were there?

Forget "Shut Up And Drive" - when it comes to the rumors about her alleged relationship to Josh Hartnett, Rihanna's all "Shut Up"!

The singer has confirmed to Allure (thanks to People) that she and Hartnett didn't have an affair during the fall.

But don't take our word for it - here's RiRi in her own words:

"He and my management, they have each other's contact information. I went to [the New York club] Pink Elephant, and he came by. All of a sudden, the next day, I'm seeing that we were kissing and hugging up each other."

Considering how closely the language of Rihanna's denial mirrors Josh's, we're inclined to believe her!