Stars on a roll for "Rock of Ages"

(CBS News) The all-star cast of "Rock of Ages," a Broadway musical-turned-film directed by Adam Shankman, is crossing oceans to promote the movie, which opens in U.S. theaters on June 15.

Pictures: "Rock of Ages" premieres worldwide

Star-studded red carpet premieres were held in Los Angeles and London in anticipation of the debut of the rock n' roll film, which includes a soundtrack of classics from rock n' roll bands such as Bon Jovi and the English rock band Whitesnake.

Special screen premieres also took place in New York City and Sydney, Australia, and were attended by actors such as Cordin Bleu, Jay Armstrong Johnson, Wesley Taylor, and Sydney actors Dan Ewing, Lisa Gormley, and Dan Wyllie. Mega-star Tom Cruise portrays the heavily tattooed, narcissistic rock king Stacee Jaxx.

Actor Alec Baldwin told CBSNews.com at the Los Angeles premiere that the "most memorable part of the experience was working with Cruise." [It] was to watch Tom perform. I mean, he did such a great job...we [the cast] couldn't believe it. Our mouths were on the floor."

Cruise also had great things to say about the overall experience of filming. "I'm so proud. I had so much fun making it, I really did," he told CBSNews.com. "It was five hours of singing and you wonder how it's going to go but I just had a blast."

The plot revolves around a small-town girl Sherrie (Julianne Hough) who moves to L.A. in the hopes of attaining fame as a singer, and city boy Drew (Diego Boneta), who is also pursuing his Hollywood dreams.

Hough tells the New York Daily News that at first, she was not going to accept the role of Sherrie, after acting in other music-themed movies like "Burlesque" and 2011's "Footloose" remake.

She had a change of heart only after director Shankman told her that Tom Cruise was also to be a cast member. She recalls, "He said, 'You know, Tom Cruise is in it.' And I was like, 'Right - I'll do one more (musical)!'"