Washington, Nov 13 Twilight director Catherine Hardwicke has added fuel to rumours that vampire series' stars Rob Pattinson, Kristen Stewart are, in fact, dating.

In a recent interview with Time magazine, the helmswoman seemed to have revealed that co-stars Robert Pattinson and Kristen Stewart are together: "After I cast him, I told Rob, don't even think about having a romance with her . . . She's under 18. You will be arrested."

Although Hardwicke didn't confirm whether the pair hooked up while making Twilight, but had close conversations with Stewart about the situation, reports Us magazine.

"In terms of what Kristen told me directly, it didn't happen on the first movie. Nothing crossed the line while on the first film," she explained.

But she added: "I think it took a long time for Kristen to realize, O.K., I've got to give this a go and really try to be with this person." (ANI)