Josh Hartnett, Abbie Cornish dating?

Josh Hartnett and Abbie Cornish have fuelled rumours that they are dating after they attended a birthday party together.

Cornish, who parted ways with long-term boyfriend Ryan Phillippe earlier this year, was seen enjoying a meal with Hartnett last week, sparking speculation that they were dating.

On Saturday, the pair attended Channing Tatum's 30th birthday bash at Macao Trading Co. in New York together.

"They turned up after midnight . . . they definitely looked like a couple," the New York Post quoted a source as saying.

The party was hosted by artist Neil Grayson, and was attended by guests including Channing's wife Jenna Dewan, Hayley Duff and her partner Nick Zano, James Ransone and Ray Liotta.