Jimmy Kimmel gave his studio a "Twilight" makeover on Wednesday (June 23) as Robert Pattinson, Kristen Stewart, Taylor Lautner and the rest of the "Eclipse" cast stopped by to chat about their upcoming flick, "Eclipse," opening June 30.

The big three came out first, followed by vociferous applause from the audience, which forced Kimmel to illuminate a special "Stop Screaming" sign installed expressly for the evening's entertainment. Talk ranged from their globe-trotting promotional tour to secret facts about the franchise to the shooting of the films themselves.

Pattinson was happy to provide an explanation as to why Lautner seems never to wear a shirt onscreen. "Whenever there's a scene where he has his clothes on, I suggest to take them off," he laughed. "Otherwise I don't know what is going on."

Nor did Lautner know what was going on during a break in their promo tour -- which started in Sydney, Australia, and gradually led them back to the States -- when he found himself swimming with sharks in the name of recreation.

"There are two things I'm afraid of: reptiles and sharks. My idea is we were going to do dodgeball or I was even going to go helicopter flying," he said, adding that the sharks he swam with were the "big" kind.

For her part, Stewart wrangled Lautner into some karaoke in their South Korean hotel. The hit of the night? Miley Cyrus' "Party in the U.S.A."

And as the show -- which includes an exclusive clip and some footage of the "Jersey Shore" cast reworking "Twilight" in a way only those G.T.L.-loving kids can -- progresses, Pattinson let fans in on a little secret about the wolves in the film. "The censors wouldn't actually allow the wolves to have genitalia," he said. "It wouldn't be PG-13 if the CGI wolves had genitalia. They're like the action figures. There's just nothing there."

We'll be live at the L.A. premiere of "The Twilight Saga: Eclipse" on Thursday, June 24. Tune in to MTV.com at 9:30 ET (8:30 Central) for our red-carpet webcast, and watch us chat with Robert, Kristen, Taylor and all your favorite stars. And don't forget to submit your burning "Eclipse" questions!

Check out everything we've got on "The Twilight Saga: Eclipse."

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