Tom Cruise's 'Intergalactic' Rock of Ages Performance

By Hannah Kay Hunt

06/22/2011 at 12:05 PM EDT

Tom Cruise made it big dancing in his tighty whities in Risky Business. But can he sing?

As far as Stephen Baldwin is concerned, he can.

Cruise, 48, is currently filming the big screen adaptation of the musical Rock of Ages, costarring Alec Baldwin, and his singing abilities are otherworldly, Alec's brother Stephen Baldwin reports.

PHOTO: Alec Baldwin Channels Bret Michaels

"The word behind the scenes is 'intergalactic,'" Stephen told PEOPLE at the Cinema Society and Grey Goose-sponsored screening of The Ledge on Tuesday in N.Y.C.

"He covered a song by a particular band, and the feedback was that the band was completely blown away," says the younger Baldwin brother. "The whispers and the rumors are that what he's doing with Rock of Ages is out of this world. Pretty cool, huh?"

The film is set to be released on June 1, 2012.