People gives a detailed brief of their time at the Marmont.The weekly entertainment magazine reports that Miller, 25, and Hartnett, 28, sat side-by-side on a couch in the hotel restaurant's living room area, laughing and chatting for about an hour before they were joined by a female friend of Miller's.So are the single actors (she split with Jude Law in November; he most recently dated his Black Dahlia costar Scarlett Johansson) an item?"They're friends, just friends," Miller's rep tells PEOPLE."Sienna stood in front of Josh while he was still sat down and he held onto her thigh." The group eventually retired to the hotel's poolside to drink cocktails.Sienna, 25, split from boyfriend Jude Law in November and Josh, 28, is said to have split from Scarlett Johansson, who he shared a New York apartment with.Sienna Miller and Josh Hartnett were spotted getting cosy at a Los Angeles hotel on Tuesday night ().
But Miller - who was wearing a grey beanie bobble hat to brave the cold - said there was nothing to the reports. Miller is at the festival to promote her new movie 'Factory Girl.' In it she plays tragic Edie Sedgwick, who inspired artist Andy Warhol.
"Later, they kissed and sneaked out together." Adds a pall, "They definitely have chemistry. She tells British film magazine Empire, "What makes me angry is that I have been linked with every single actor I've ever met.
I've just come out of a relationship I was in for three years and before that I was in a relationship for two years, so I've actually had a boyfriend for the last five years.
Sienna Miller and Josh Hartnett certainly seemed cozy at Hollywood's Chateau Marmont on Tuesday night.
Miller, 25, and Hartnett, 28, sat side-by-side on a couch in the hotel restaurant's living room area, laughing and chatting for about an hour before they were joined by a female friend of Miller's.
On the red carpet Miller dished, "Absolutely no truth, I'm afraid to say.