Is Alec Baldwin in or out of New Line’s Rock of Ages? We might have a better idea today after Baldwin takes part in a full run-through of the ’80s-flavored rock musical being held in an hour or so on the Miami set where the picture will be shot. Except for Catherine Zeta-Jones (who’s shooting the Gerard Butler starrer Playing The Field that FilmDistrict acquired this morning), Baldwin will take part with the entire cast of Tom Cruise, Russell Brand, Mary J. Blige, Paul Giamatti, Malin Akerman, Bryan Cranston, Diego Boneta and Julianne Hough. They’ll be trying out costumes and belting out 80s tunes as they prepare for a May 23 production start. Director Adam Shankman will be hoping that by the end of today, Baldwin will have a change of heart, which was prompted by personal reasons.