Paul Giamatti signs on to <i>Rock of Ages</i>Paul Giamatti is the latest to join the all-star cast of the Warner Bros. musical Rock of Ages.

The actor will play the manager of Tom Cruise's rock star character, Stacee Jaxx. We reported earlier today that Amy Adams is being sought for the role of a journalist who has a fling with Stacee Jaxx.

Adam Shankman is directing Rock of Ages from a screenplay by Chris D'Arienzo, who adatpted his own stage musical. Production will start on May 19 in Florida.

Testing will take place this weekend in Los Angeles for the role of Drew Boley, a rock guitarist who falls for Stacie Christian (Julianne Hough). You can CLICK HERE for more details on that casting call.