Are you ready for a sneak peek at tomorrow's blockbusters today? Check out our new series "Behind the Screen" Sunday night at 11 p.m. on MTV for the broadcast premiere of the "Brüno" trailer, the very first visit to the set of Russell Brand's "Get Him to the Greek" and much more!

The star-gazing, OMG-generating, anything-might-happen madness that is the 2009 MTV Movie Awards has just shot into the celebrity stratosphere: "Twilight" stars Robert Pattinson, Kristen Stewart and Taylor Lautner will be presenting an exclusive, never-before-seen clip from their upcoming vampire sequel "New Moon" during the live broadcast.

Joining the "Twilight" trio will be a group of newly announced Hollywood presenters: Sandra Bullock, Dwayne Johnson, Sienna Miller, Channing Tatum, Danny McBride, Abigail Breslin, Bradley Cooper, Thomas Lennon and Sofia Vassilieva.

This high-powered crew will hook up with previously announced presenters Denzel Washington, Cameron Diaz, Ryan Reynolds, Will Ferrell, Vanessa Hudgens, Leighton Meester, Jonah Hill and Lil Wayne. Eminem is set to take the stage, where he'll perform music from his new album, Relapse, and Kings of Leon will perform live on MTV for the first time ever, rocking out with their hit song, "Use Somebody."

Heading into the Andy Samberg-hosted event on May 31 at 9 p.m. ET, "Twilight" leads all movies with seven nominations, including nods for Pattinson (Breakthrough Performance Male), Stewart (Best Female Performance) and Lautner (Breakthrough Performance Male).

Several of the new presenters are also up for awards. "Get Smart" star Johnson will vie for Best Villain, McBride will battle it out for Best Fight (based on his "Pineapple Express" throwdown with Seth Rogen and James Franco), and Lennon will pucker up for Best Kiss (thanks to his lip-locking scene with Paul Rudd in "I Love You, Man").

For the first time in the 18-year history of the awards show, viewers chose the nominees for the Golden Popcorns. They can vote for the winners through May 27 by going to MovieAwards.MTV.com. Voting in the Best Movie category will stay open through the live telecast, so anything that takes place onstage has the chance to sway the eventual outcome.

Will the vampires grab more trophies than the slumdog? What was the year's ultimate onscreen WTF moment? It's up to you to decide the winners of the 2009 MTV Movie Awards. Vote now, and tune in on May 31 at 9 p.m. ET, when the big show airs live from the Gibson Amphitheatre in Universal City, California.

Check out everything we've got on "New Moon."

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