Kristen Stewart can't imagine having anyone except Robert Pattinson playing her 'Twilight Saga' love interest.

The co-stars recently rekindled their off-screen romance after Robert, 26, forgave the 22-year-old actress for cheating on him and Kristen knew from the first time they met that he was the perfect guy to play vampire Edward Cullen.

She told E! News: ''I guess at this point, I can't really imagine it. It's so obvious; it slaps you in the face anytime you meet somebody who you're like, 'We definitely need to work together!' We clearly are into this, maybe not for the same reasons, because he's a nut, but I knew instantly. With Taylor [Lautner] too. I take full and complete credit for those boys.''

Kristen and Robert filmed an intense ''vampire sex'' scene for 'Breaking Dawn Part 2', the final film in the franchise but she admitted it was disconcerting because they had to look at the camera rather than at each other the entire time.

She said: ''[The director] Bill [Condon] kept saying that he wanted to make this one feel like you're very much inside of the experience. Like you're there, you're sort of a part of it, which is odd. But to do that we had to look directly into the camera instead of at each other.

''It was awful. I was like, 'Bill, you're depriving me of this experience. We've been waiting for vampire sex! What are you doing?!'''