Alec Baldwin Joins 'Rock of Ages' Cast

Alec Baldwin - 30 Rock PR Shot - 2010
Art Streiber/NBC Universal, Inc

The "30 Rock" star is latest addition to director Adam Shankman's film musical, also starring Tom Cruise, Julianne Hough and Mary J. Blige.

30 Rock star Alec Baldwin has joined the cast of Rock of Ages, New Line's adaptation of the Broadway musical. The film's director Adam Shankman announced Baldwin's participation via Twitter Friday: " Based on info I got today, I'm gonna confirm Alec Baldwin as Dennis in Rock Of Ages. Hollah."

In a separate tweet, Shankman added, "Can't wait to start #rockofagesmovie. Julianne Hough, alec Baldwin, Mary j Blige, Tom cruise confirmed. I love my cast. More to come."

As previously reported by The Hollywood Reporter, Baldwin had been offered the role of Dennis Dupree --  an ex-rocker hanging onto his glory days while he runs the Rock of Ages nightclub -- after Will Ferrell and Steve Carell passed.

Former Dancing With the Stars pro Julianne Hough boarded the project this past week as Sherrie, a small-town girl who comes to Hollywood to become a part of the 80s rock scene but takes a detour as a stripper.

Shankman is directing from a script by Chris D'Arienzo.