Robert Pattinson believes in love at first sight.

The 'Water for Elephants' actor - who is dating his 'Twilight' co-star Kristen Stewart - thinks people can fall for each other as soon as they meet and says if there's not an initial attraction, it's hard to ever develop feelings for that person.

He told MTV News: "I think people can fall in love at first sight. I think pretty much all people who love each other, had some kind of thing at first sight. I mean, there has to be some kind of moment where you, like, feel a different energy around someone.

"Generally, if you don't notice someone ever, you're probably not going to fall in love with them."

As well as believing in love at first sight, the 24-year-old heartthrob recently revealed he has a "romantic soul" and could never have sex with someone he didn't love.

Robert said: "There is the idea of the saving love, I believe it. I'm not mushy but I have a romantic soul. Having grown up with two older sisters I have a deep respect for women. Sex and feeling for me go hand in hand.

"I'm not interested in casual relationships, I need to know people."