The Twilight Saga: Eclipse is the third film in the ongoing and insanely popular Twilight series of movies based on the books by Stephenie Meyer.

This video shows the first full trailer to be released for the film, and replaces a short ten-seconds long preview clip which was doing the rounds yesterday.

Eclipse once again stars Kirsten Stewart as Bella, Robert Pattinson as Edward, and Taylor Lautner as Jacob. And this film more than any focuses on the love triangle between the trio of young starlets.

There’s also obviously some BS about vampires, werewolves, and whether Bella should remain human. But we won’t worry about that.

The Twilight Saga: Eclipse is due to be released on June 30, 2010 in the U.S., with other countries to follow. There’s sure to be a lot of teenage girls having sleepless nights in the run up to its release.