Robert Pattinson to star in 'Parts Per Billion'

"Twilight" star Robert Pattinson will join Rosario Dawson, Olivia Thirlby and Dennis Hopper in "Parts per Billion," according to MTV.

Brian Horiuchi is directing the film, which follows three couples who risk being torn apart after struggling with the same event. The film is described as an ensemble story with different storylines.

Pattinson had been in the media spotlight ever since he signed on to star in "Twilight." He's already on board for "New Moon," although he will shoot "Parts per Billion" first.

During her interview with MTV, Dawson said she's excited to meet and work with Pattinson, although their characters never really meet in the film.

By the way, did you catch the trailer for Pattinson's other flick, "Little Ashes"? Click here if you missed it.