Robert Pattinson has denied he is dating his Twilight co-star Kristen Stewart.

The pair, whose characters are passionately in love in the vampire series, have faced constant speculation about their personal relationship over recent months.

They were last spotted together last week during Rob's 23rd birthday celebrations in Vancouver BC, the location for Twilight sequel, New Moon.

But Rob told Look magazine in an new interview that they were not an item.

“No! She has a boyfriend. I don't know where that came from,” Rob said.

Meanwhile, the actor also revealed that he wasn't dating anybody at the moment because he had struggled to talk to women since Twilight had become so successful.

“It's very uncomfortable. If you try and chat people up, everyone's like: 'Oh, you probably go around sleeping with everybody'," he said.

"So it kind of has the converse effect of what you would have thought.”

Robert Pattinson and Kristen Stewart - Just Friends