At the Hollywood premiere of "The Twilight Saga: Breaking Dawn - Part 1," Tinseltown was abuzz with all things Kristen Stewart, Robert Pattinson and Taylor Lautner. Even Adam Shankman, director of the upcoming movie musical "Rock of Ages," couldn't help but gush about Pattinson in particular.

"Rob is a good singer. There were times during the 'Rock of Ages' casting process [we thought of him], and he was never available," Shankman told MTV News' Josh Horowitz. "That just was never able to happen. There were a million times when we were supposed to get together and talk, but the dude is so busy."

Aside from not being able to land Pattinson for a role, Shankman said the musical will indeed rock -- so much so that even the men out there will enjoy it. "The movie really is like a musical for straight guys," Shankman laughed. "Guys are going to be super pumped to go with their girlfriends."

Though the film's casting process snagged headlines early on, we haven't heard or seen too much from "Rock of Ages," but Shankman said that should change soon, when a trailer arrives this month. The director said the wait will be worth it for all of the craziness we'll end up seeing. "It is a batsh-- crazy movie," he said. "It is a ride from beginning to end; it is giant movie stars singing classic-rock karaoke in '80s drag having the time of their lives. It's just a big party."

The one thing we have seen from the film is an official snapshot of Tom Cruise, rocking out, minus a shirt, and at the premiere, Shankman hyped up the "Mission: Impossible" star's rock abilities. "For Tom, well, I would say he does an insane version of 'Pour Some Sugar on Me,' that every time I show it to people, they're like, 'Can we see that again?' " Shankman said.

According to the director, things get even more heated when Cruise teams up with Malin Akerman for a power ballad. "He and Malin Akerman do one of the most outrageous interpretations of 'I Want to Know What Love Is'; I just hope I get it past the ratings board," he said.

The number is so out-there, according to Shankman, that he considers it the craziest thing he's directed. "[Malin] is fearless, she's awesome," he said. "We knew you couldn't tell jokes about rockers in the '80s halfway, so it's very funny, but it's also sexy and it's a little insane. I've never made anything that is that nuts.

Check out everything we've got on "Rock of Ages."

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