Daniel Radcliffe and Emma Watson in "Harry Potter And The Half-Blood Prince"
Photo: Warner Bros.

The killer MTV Movie Awards updates are coming fast these days. Earlier this week, we dropped a bomb about the "New Moon" cast presenting an exclusive clip from their upcoming "Twilight" sequel during the live broadcast. Now we can reveal that during the show, viewers will get an exclusive sneak peek at two summer blockbusters: "Harry Potter and the Half-Blood Prince" and "Transformers: Revenge of the Fallen."

Daniel Radcliffe, Emma Watson and Rupert Grint will present a never-before-seen clip from "Half-Blood Prince," the sixth movie adaptation of the J.K. Rowling boy-wizard book series. Megan Fox and director Michael Bay will show off a fresh clip from "Revenge of the Fallen," the sequel to the 2007 box office smash about shape-shifting robots.

But that's not all. Joining the list of Hollywood presenters will be "Transformers" star Shia LaBeouf. The actor is also competing in the Best Male Performance category for his role in the paranoid thriller "Eagle Eye."

The roster of celebrity presenters already includes Will Ferrell, Lil Wayne, Denzel Washington, Cameron Diaz, Sandra Bullock, Leighton Meester and Channing Tatum, Sienna Miller, Abigail Breslin, and Danny McBride, among others. 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."

"Saturday Night Live" funnyman Andy Samberg will host the 18th annual MTV Movie Awards live at 9 p.m. ET on May 31 from the Gibson Amphitheatre in Universal City, California.