Actress Mischa Barton has fuelled reports she is unhappy with her new movie You And I, after reportedly refusing to promote it.

The former The O.c. star initially sparked rumours of her dissatisfaction when she failed to attend the film's premiere at the Cannes Film Festival in France earlier this month.

She insisted she "was never due to go", but now You And I director Roland Joffe cannot locate Barton in London to complete promo duties in the British capital.

He tells New York gossip column PageSix, "She hasn't pulled out of interviews, she's pulled out of everything... Her room is here, she is here, but trying to get the two together has just been impossible. We just don't know where Mischa is."

In the film, Barton plays a Russian lesbian who falls in love at a t.A.T.u concert.