Robert Pattinson and Kristen Stewart can't agree on who is the most romantic in their relationship.

While still keeping us guessing about what exactly this 'relationship' entails - friends? lovers? friends with benefits? - the pair did discuss who was more romantic when quizzed in a new interview.

Kristen thinks it's her leading man: “I have a no-bullshit detector," she tells Vanity Fair, "so I'd have to say Rob is. I think romance is anything honest. As long as it's honest, it's so disarming."

Rob disagrees: "No. I'm better at faking," he laughs.

They may not see eye-to-eye on this point, but Rob and Kristen are in agreement about their rare and instant chemistry.

Kristen says that, during their near-mythic audition for Twilight, which famously took place in director Catherine Hardwicke's bedroom, "we were very reactive. We had a very responsive, palpable thing."

Robert has since tried and failed to replacate their easy connection with another potential leading lady.

He explains: "I was calm and collected (with Kristen), and then we do this thing where we're pretty much making out.

“I've since tried to do it at another audition, but it completely just collapsed."

Rob and Kristen in pictures