Robert Pattinson thinks he looks like he is smelling a fart in the first Twilight film.

The British actor is currently promoting the final instalment of the vampire series, The Twilight Saga: Breaking Dawn Part 2, which also stars Kristen Stewart as Bella Swan.

Robert - who plays Bella's love interest Edward Cullen in the movies - has revealed his favourite scene from all of the films.

"There's a few. I like the scene when Bella walks past Edward for the first time. Whenever I see it I'm making the most ridiculous facial expression. I was so serious when I was doing it," he quipped in an interview with Australian radio show Kyle and Jackie O.

"Looking at it now I'm like, 'Oh my God, you were on another planet!' It looks like she's farting when Edward walks past. Terrible."

Robert also discussed the films that have made him cry in the past. The 26-year-old hunk admits to shedding a few tears at the 2008 comedy-drama Marley & Me - which stars Owen Wilson, Jennifer Aniston and an adorable yellow Labrador.

"Marley & Me. I was so surprised that I was devastated. It was awful. I never want to see it again. I can't take it. I hate people but I love dogs," he laughed when explaining about Marley's death at the end of the movie.