Kristen Stewart thinks she and Robert Pattinson's romance was what the 'Twilight Saga' "needed".

Kristen Stewart and Robert Pattinson in 2013 when they were dating

Kristen Stewart and Robert Pattinson in 2013 when they were dating

The former couple started dating shortly after 'Twilight', the first film in the series premiered in 2009, and went on to star in another four movies in the franchise, and although the actress - who is now engaged to girlfriend Dylan Meyer - thinks she and the 'Lighthouse' actor were "young and stupid" at the time, she believes their genuine feelings for one another boosted the franchise.

She said: "[Robert had an] intellectual approach that was combined with ‘I don’t give a f*** about this, but I’m going to make this sing.’ And I was, like, ‘Ugh, same.’

“And, whatever, we were young and stupid and, not to say that we made it so much better, but that’s what it needed, and that’s what anybody playing those parts needed to feel.”

The 31-year-old star knew immediately after meeting Robert, 35, that he was the right person to play vampire Edward Cullen opposite her as Bella Swan.

She told the New Yorker magazine: "It was so clear who worked."

Kristen is working on her movie debut as a director with the adaptation of Lidia Yuknavitch's memoir 'The Chronology of Water' and her screenwriter fiancee has been reading drafts of the script.

The 'Spencer' actress admitted it is essential for their relationship that she has someone who shares her passion for working and making movies.

She said: “I’ve been with people where work isn’t at the forefront of the thing and therefore you don’t do it as much. That’s not good for me. I don’t like that.

"When you find somebody that, every aspect of your life—well, I guess I don’t have many aspects. I want to make movies. That’s primarily what I want to work on, and we share that, luckily."