Kristen Stewart has admitted she hates watching her own sex scenes in the 'Twilight Saga: Breaking Dawn Part 2'.

Speaking on Conan O'Brien's night time talk show 'Conan', the 22-year-old actress revealed she is embarrassed by her attempts at a 'sexy face' during the romantic scenes with real life boyfriend Robert Pattinson.

She joked: 'It's nice to see your own reflection while your making 'shmexy' faces,' before adding, 'It's absolutely absurd, actually.... I want to shoot myself.'

In the same interview, Kristen also disclosed that she found it easy to quit smoking because she was never addicted to nicotine

She explained on the chat show: 'I was a bit of a faker, a circumstantial smoker. I just feel like I wasn't addicted to nicotine. I just wanted something in my mouth.'

Meanwhile, Kristen said starring in the 'Twilight Saga' film franchise was a 'once in a lifetime' experience but she was not impressed with the contacts she had to wear when her character became a vampire in the final movie.

'Those red contacts are awful - like, tunnel vision, wallpaper eyes,' she said, but added that the transformation to vampire felt right.

'I think I've been sitting around for years watching everyone else do it. I've played Bella every step of the way as a human, so that final one made so much sense to me, I was raring to go.'