Alec Baldwin Joins 'Rock of Ages' Cast

An upcoming movie, Rock of Ages, just added a big name to its marquis. That is, 30 Rock's Alec Baldwin will star in the big screen musical alongside Tom Cruise, Mary J. Blige and Julianne Hough!

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According to PopEater a very excited director Adam Shankman tweeted, "So, based on info I got today, I'm gonna confirm Alec Baldwin as Dennis in Rock Of Ages. Hollah." As for Alec's role, he'll play Dennis Dupree, an ex-rocker who runs the nightclub in order to continue to grasp his rock star past.

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The director added another Tweet: "Can't wait to start #rockofagesmovie. Julianne Hough, alec Baldwin, Mary j Blige, Tom cruis confirmed. I love my cast. More to come."