Catherine Zeta-Jones is hard at work on the Miami set of Rock of Ages, and director Adam Shankman couldn't wait to show one of his leading ladies in action. Hard to believe this character isn't even in the original Broadway production!

Michael Douglas' wife plays a conservative mayor's wife who is anti rock & roll. Some are comparing her look to congresswoman Michele Bachman ... known to be committed to promoting conservative values.

Shankman Tweeted this photo and the following:

    "Look at my Catherine Zeta Jones! It's so good to have you back in a musical! So brilliant!"

Read what Shankman had to say about the character he created for Zeta-Jones ... after the jump.