Josh Hartnett Dating Actress Damm?

Josh Hartnett has sparked rumours of a new romance with model-turned-actress Katharina Damm.

Damm, who has a featured role in upcoming movie Blue Crush 2, reportedly met the actor earlier this year (10) at a party he hosted, and a source tells the New York Post the couple's relationship has heated up in recent months.

The Hollywood heartthrob Hartnett's love life previously hit headlines when he was linked to actress Abbie Cornish back in April (10), and he was linked romantically to model Helena Christensen and Kirsten Dunst back in 2009.

But the couple is playing coy about the rumoured new romance, refusing to confirm or deny if there is truth to the claims.

Damm and a spokesperson for Hartnett said "no comment."