'The Twilight Saga: Breaking Dawn Part 1' Trailer Teaser Shows Bella's Baby Bump (Video)

Summit Entertainment

Kristen Stewart, Robert Pattinson and Peter Facinelli appear in a 15-second snippet of the official trailer.

While fans caught a sneak peek of Kristen Stewart clutching her stomach in a still released earlier this year, the upcoming trailer features a closer look at her rapidly expanding baby bump.

PHOTOS: The Evolution of Film Vampires

Summit Entertainment released a 15-second teaser snippet on Friday, Sept. 9, featuring Bella (Stewart), Edward (Robert Pattinson) and Dr. Carlisle Cullen (Peter Facinelli) as they all react to the surprising pregnancy. Also included is Taylor Lautner as Jacob, who warns that his wolfpack is “coming for Bella.”

“It’s impossible,” gasps Bella while feeling her offspring move. Next, a sudden jerk throws Edward into action.

PHOTOS: 'Twilight: Breaking Dawn': New Pictures From the Film

“The fetus is too strong and fast-growing,” explains Carlisle.

Adds Edward, “It’s crushing you, from the inside out.”

Watch the 15-second snippet below. The official trailer debuts on Tuesday Sept. 13 at 7:30 pm ET/4:30 pm PT on Yahoo! Movies.