The actor is reprising the role of Dr Carlisle Cullen in New Moon, the sequel to the vampire flick, and said "it was a lot of fun rejoining with the cast - it was like we hadn't even missed a day".
Peter, who stars alongside Robert Pattinson and Kristen Stewart in the films, went on: "It's really interesting because it's always been like a family."
He said: "You put the make-up on, you put the contact lenses in, you look in the mirror. There's the character. We have different contact lenses that are going to 'pop' a little bit more"
Peter also revealed he's set to make the third film in the series.
"Eclipse we're shooting in the fall," he said. "If the fans come out for the second movie and third movie, hopefully we get to shoot the last book and complete the series. That would be phenomenal."