Def Leppard fans -- and 80's rock fans in general -- can breath a sigh of relief. Next summer's hair-rock movie starring Tom Cruise won't make 'Gigli' seem like a good idea. 'Rock of Ages,' starring Cruise, Alec Baldwin, Russell Brand and others, hits theaters next June, and Def Leppard guitarist Phil Collen says he can't wait to watch Cruise singing his band's music.

"I was so impressed because he hadn't sung before and he had vocal lessons," Collen tells VH1 Classic Rock Nights. "And we saw him and he was amazing, it was like Iggy Pop meets someone else and he's in great shape and it was like, 'What!?!'"

"It was surreal, but he really pulls it off and it was like he's a total rock star." Cruise trained with Axl Rose's voice coach for five hours a day to prepare to sing songs like 'Pour Some Sugar on Me' and Bon Jovi's 'Wanted Dead or Alive.' He also asked Jon Bon Jovi for advice. The 'Living on a Prayer' singer tells 'Extra' he told him "'Relax man, you’re Tom Cruise, you can learn how to sing a song, don’t worry about it!'"

The movie is an adaptation of a Broadway musical of the same name. It's a love story told through the music of 80's rock. Cruise plays an aging musician named Stacee Jaxx, who's well beyond his best days. No worries, there's no doubt the fictional singer could sell out a decade's worth of reunion tours.