Alec Baldwin Joins 'Rock Of Ages' Cast

Ever want to see Alec Baldwin rock out? You're about to get your wish.

The man who plays pent-up, suit wearing Reaganite executive Jack Donaghy in "30 Rock" has signed on to play a has been rocker and night club owner in the upcoming film version of "Rock of Ages." The film's director, Adam Shankman, tweeted the news on Friday, saying, "So, based on info I got today, I'm gonna confirm Alec Baldwin as Dennis in Rock Of Ages. Hollah."

Dennis is Dennis Dupree, the one-time rock icon hanging on to his glory days. It was reported back in December that he was offered the role.

Baldwin will join Tom Cruise, Julianne Hough and Mary J. Blige in the film. Cruise, who was confirmed for the film in February, will play Stacee Jaxx, also an aging musician working to hang on to the glory days, while Hough will take on the role of a small town girl looking to find her dream in Los Angeles.

Excitingly, both Baldwin and Cruise will sing hits from the 70's and 80's, making this a must see.