Kristen Stewart starts to "smell bad" when she gets nervous.

The 'Twilight' star admits she clams up when she is being interviewed and starts to sweat profusely because of the pressure.

Kristen, 20, explained to Stylist magazine: "You get so nervous - I don't know how to deal with it. When I'm nervous, I'm so mindless. I twiddle my thumbs and my hands sweat and I smell bad."

The actress' boyfriend and 'Twilight' co-star Robert Pattinson previously had to refute rumours he didn't shower on the set of the franchise's second film 'New Moon', after an anonymous source accused him of "driving people crazy" with his body odour.

He said: "I do shower!"

In Kristen's next film, 'The Runaways', she is seen kissing co-star Dakota Fanning, but the 'Twilight' star insists the smooch is no big deal.

She said: "It's very innocent in the movie, just a kiss. Of course, everyone's talking about it like it's a huge deal but it was so natural and impulsive. And it's like five seconds in the movie."

The film tells the true story of rock star Joan Jett - who the 20-year-old actress portrays - and her all-girl band The Runaways, a teenage group from the 70s. Dakota plays the group's singer Cherie Currie.