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First Look: Tom Cruise Shirtless in 'Rock of Ages'

Tom Cruise will star as a hair band superstar in "Rock of Ages" -- and today we're getting our first look at him in all his shirtless rocker glory!

The film's director, Adam Shankman, just posted the above photo on his Twitter, with the message "Ladies and gents: first look at tom cruise as stacee jaxx! First day of shooting!"

It sounds like yesterday was actually Tom's first day on set, with Shankman also saying he filmed a scene with Def Leppard. Click the pic to zoom in on Tom's tattoos.

While Tom just started, shooting actually started last month -- with co-stars Julianne Hough, Diego Boneta, Alec Baldwin and Russell Brand all spotted on set.

Check out all the behind-the-scenes shots!