What's Going on Between Sienna Miller and Josh Hartnett?

New couple alert, Sienna Miller and Josh Hartnett. The twosome was spotted getting cozy at Hollywood's Chateau Marmont on Tuesday night January 16th.

An onlooker reported that Miller and Hartnett 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.

Nonetheless, the in-love pair kept things intimate with Miller stood in front of a seated Hartnett, who held on to her thigh with his hand. The pair eventually headed out, cocktails in hand, to the hotel's poolside bungalow area.

Could this be a sign that the two dating? If the speculation is true, it will surely untrue rumors on Hartnett getting back with Scarlett Johansson while also rubbish recent rumors claim Miller dating Leonardo DiCaprio.