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

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.

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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.

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“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.